The Internet Pinball Serial Number Database or IPSND collects serial numbers of pinball machines and publishes a database of these on the Internet. Our goal is to make available a registration of all pinball machines in existence and allow tools for slicing, dicing and visualization of the data.

Games: 6,107  Serials: 43,078  Visitors: 20,377,397  Members: 4,121  Photos: 20,654  Lat/Lng: 21,074  Masks: 3,144(51.48 %)  Traits: 463  Nudges: 105,278  Backglasses: 1,847
  Most Serials: Twilight Zone(914)  Most Submissions: Rod McLarge(2,881)  Most Points: Rod McLarge(24,636)  Highest Quality: EM-fan(9.24)  Most Nudges: King of Pinball(13,962)
Twilight Zone - IPSND/IPDB No. 2684 - April 1993
Backglass Image
Manufacturer: Midway Mfg. Co., a subsidiary of WMS Industries, Inc.
Players: 4
MPU: Williams WPC (Fliptronics 2)
Production Run: 15,235
Game Type: Solid State Electronic (SS)
Model: 50020
Submissions: 851 serials of 15,235 (5.59 %)
Coverage help:

Coverage is a mathematical interpretation of the serial numbers that have been submitted so far. The term 'coverage' relates to the amount of the production run that has been 'covered' in the given submissions.

There are two coverage methods shown, each has a different approach of calculating an guess on the number of games produced by analysing the currently submitted serial numbers.

Linear: Linear coverage simply looks at the highest serial number and subtracts from it the smallest serial number to estimate the number of games produced. For some games, this works fine because the serial numbers were sequential and without gaps (Early Bally, Early Stern, etc). However, this approach starts to fail quickly for games that serial numbers are part of a bigger numbering scheme (Williams pre 1984, Current Stern) or that intentially had gaps/skips in the numbering sequence(Gottlieb post 1960). If you see a linear coverage number that is higher than the known production run, it is probably not the best way to look at the serial range and you should look at the clustered approach below.

Clustered: Clustered coverage assumes that there are gaps/skips in the serial sequence for a game. It groups the serial numbers together based upon how close they are to the next serial number in the sequence. If they fall within a certain threshold then the SerialBot assumes that there are valid serial numbers between the two. If they are far enough apart, then the SerialBot assumes this is a gap. Once all the gaps and groups are determined, it sums up all the linear ranges in each group. This way, if a sample run of games started at 15,000-15,100 and the production games started at 17,000 onwards, it would assume that the serial numbers between 15,100-17,000 were a gap an are not counted. Using this method, as more serial numbers are submitted the gap analysis will get more accurate.

977,301 (6,414.84 %) linear / 123,530(810.83 %) in 71 clusters 761 wide.
United States: 573 _serials Romania: 1 _serials Serbia: 1 _serials Slovenia: 1 _serials Hong Kong: 1 _serials Luxembourg: 1 _serials Japan: 1 _serials Isle of Man: 1 _serials Bahrain: 1 _serials Ireland: 1 _serials Israel: 1 _serials Hungary: 3 _serials Poland: 3 _serials Croatia: 3 _serials Brazil: 3 _serials South Africa: 3 _serials Puerto Rico: 3 _serials Argentina: 3 _serials Korea, Democratic People's Republic of: 4 _serials Norway: 5 _serials Denmark: 6 _serials Austria: 7 _serials Spain: 7 _serials Italy: 7 _serials Switzerland: 11 _serials France: 11 _serials Australia: 15 _serials Belgium: 16 _serials Sweden: 17 _serials Canada: 20 _serials Finland: 27 _serials Germany: 27 _serials Netherlands: 30 _serials United Kingdom: 35 _serials New Zealand: 65 _serials United States: 573 _serials Romania: 1 _serials Serbia: 1 _serials Slovenia: 1 _serials Hong Kong: 1 _serials Luxembourg: 1 _serials Japan: 1 _serials Isle of Man: 1 _serials Bahrain: 1 _serials Ireland: 1 _serials Israel: 1 _serials Hungary: 3 _serials Poland: 3 _serials Croatia: 3 _serials Brazil: 3 _serials South Africa: 3 _serials Puerto Rico: 3 _serials Argentina: 3 _serials Korea, Democratic People's Republic of: 4 _serials Norway: 5 _serials Denmark: 6 _serials Austria: 7 _serials Spain: 7 _serials Italy: 7 _serials Switzerland: 11 _serials
Parts: 3 _serials Unknown: 6 _serials Complete: 905 _serials Complete: 905 _serials Parts: 3 _serials Unknown: 6 _serials Complete: 905 _serials
Body Only: 1 _serials Other Parts: 68 _serials Complete Game: 845 _serials Complete Game: 845 _serials Body Only: 1 _serials Other Parts: 68 _serials Complete Game: 845 _serials
Cluster Serial Number SerialBot Submitted By Country Game Part

Submit a new Game Trait

The following traits help

Game Traits are properties for an individual game that you would like to see tracked along with the other information gathered for a serial number submission. Some examples of existing traits are... Joust: Black or Blue bottom Arch, Black Knight: Faceted Inserts or Normal Inserts, Twilight Zone: 3rd Magnet Installed or not.

have been submitted for this game...

Field NameDescriptonSubmitted BySubmit DateSubmitted
Lock lamp insert color The original Lock lamp was green. (Historically, lock lamps are green.) However, the small arrow was so far from the player, and so tucked under the ramp and clock, that it was very difficult to see. The lamp was changed to a brighter yellow sometime during production. Flippergubben12/1/2008221
Clock Face Some earlier games had a black and white clock face, most production games have a color face. Zak Enyart2/19/2009267
Two Magnet or Three Magnet Spiral Earlier versions of this game featured three magnets in the spiral, but one was removed for production games. It is possible to retrofit for the third magnet. How many does this machine have? Zak Enyart2/19/2009204
Has Powerfield 'flip here' text Some games have the text 'Flip Here' printed on the Powerfield and others do not. (Valid Values: Yes,No)
Fun House10/25/201613

Cluster Serial Number Country

This section lists any known game part serials that happen to match this game's serial mask (if defined). What this can tell you is if a game has any orphaned parts that might exist in other machines. This generally applies to CPU/MPU boards, Driver Boards, Display boards etc that are easily moved from game to game. Repair shops and distributors often robbed parts from other 'scrap' games laying around in a pinch if they were not able to fix the original part or of the original part was damaged beyond repair. If serials start showing up in the database as 'game parts', there is potentially a good chance that that game has been parted out completely, which is unfortunate. It is becoming more and more common for people to part out games and sell them on ebay simply because the seller can often make more money that way.... Please do not sacrifice complete games for money!!!

SerialBotSerial NumberTypeSubmitted ByCountryDetails
22979 50120067371 Flipper Board John Vorwerk United States flag United States
35708 50120081011 Flipper Board Rod McLarge United States flag United States
38028 50120081051 MPU/CPU Rod McLarge Puerto Rico flag Puerto Rico
42417 50120085201 Solenoid Driver Antti Peltonen Finland flag Finland
32707 50220048521 Sound Board Rod McLarge United States flag United States
18796 50220078382 Display/Driver Pepon Spain flag Spain
48074 50220118642 MPU/CPU Dennis Braun United States flag United States
50038 50220130651 Display/Driver Fun House Germany flag Germany
48946 50220135162 Display/Driver Fun House Korea, Democratic People's Republic of flag Korea, Democratic People's Republic of
48424 50220145122 Flipper Board Rod McLarge Netherlands flag Netherlands
43781 50220217991 Sound Board Rod McLarge United States flag United States
50527 50220249151 Display/Driver Dennis Braun United States flag United States
43532 50320152391 Coin Door BVC Austria flag Austria
11586 50720213771 Sound Board John Duchi United States flag United States
42424 51020046241 Display/Driver Antti Peltonen Finland flag Finland
31382 51020075052 Display/Driver Antti Peltonen Finland flag Finland
43225 51020130252 MPU/CPU Rod McLarge United States flag United States
26830 51120192391 Display/Driver Antti Peltonen Finland flag Finland
29518 51420041421 Solenoid Driver Ric Turner United States flag United States
10559 51420041421 Flipper Board John Duchi United States flag United States
35985 51420150281 Sound Board Rod McLarge United States flag United States
50572 51520100702 Display/Driver Fun House Netherlands flag Netherlands
49583 52020110962 Sound Board Dennis Braun United States flag United States
26899 52020115161 Solenoid Driver John Vorwerk United States flag United States
11415 52020122761 MPU/CPU John Duchi United States flag United States
52086 52020141431 MPU/CPU Rod McLarge United States flag United States
33520 52120044811 Display/Driver Antti Peltonen Sweden flag Sweden
33519 52120067181 Flipper Board Antti Peltonen Sweden flag Sweden
30991 52120177091 Power Supply Adam Pretorius South Africa flag South Africa
14273 52220135331 Display/Driver brett johnston Australia flag Australia
48223 52320162031 Flipper Board Dennis Braun United States flag United States
49634 52520097021 Flipper Board Fun House Korea, Democratic People's Republic of flag Korea, Democratic People's Republic of
50823 52520101281 Display/Driver Fun House Netherlands flag Netherlands
31334 52520125321 Solenoid Driver Antti Peltonen Finland flag Finland
14625 52520158152 Other/Unknown Juhana Uotila Finland flag Finland
18805 52520230621 Display/Driver John Vorwerk United States flag United States
48813 52720069812 MPU/CPU Seal Clubber United States flag United States
30677 52720083501 Display/Driver Pat Herbert United States flag United States
18147 52720113742 Flipper Board John Vorwerk United States flag United States
32816 52720128111 MPU/CPU Rod McLarge Canada flag Canada
51324 52720140361 MPU/CPU John Vorwerk United States flag United States
52478 52720142941 MPU/CPU Fun House United States flag United States
17404 52720144442 Display/Driver John Vorwerk United States flag United States
23840 52720147281 Solenoid Driver Seal Clubber United States flag United States
35402 52720149351 MPU/CPU Rod McLarge United States flag United States
51027 52720150831 Display/Driver Fun House United States flag United States
24690 52720152041 Sound Board Carlos Regis Brazil flag Brazil
49115 52720154601 Sound Board Rod McLarge United States flag United States
49114 52720154601 Sound Board Fun House United States flag United States
29022 52720154641 Solenoid Driver John Vorwerk United States flag United States
35670 52720158601 Display/Driver Rod McLarge United States flag United States
41067 52720158861 MPU/CPU Rod McLarge United States flag United States
18146 52720169731 Solenoid Driver John Vorwerk United States flag United States
29208 52720196541 Flipper Board John Vorwerk United States flag United States
41755 52720196751 Power Supply Rod McLarge United States flag United States
24634 52720201921 MPU/CPU John Vorwerk United States flag United States
32285 52720207691 MPU/CPU Rod McLarge United States flag United States
32449 52720224531 MPU/CPU Antti Peltonen Finland flag Finland
47798 53220101091 Flipper Board Rod McLarge United States flag United States
50035 53220119332 MPU/CPU Fun House United States flag United States
23324 53220119872 Display/Driver John Vorwerk United States flag United States
34650 53220123602 MPU/CPU Rod McLarge United States flag United States
36091 53220156811 Sound Board Felix United States flag United States
24735 53220182491 Display/Driver John Vorwerk United States flag United States
48541 53220201991 MPU/CPU Rod McLarge United States flag United States
17422 53220202181 Display/Driver John Vorwerk United States flag United States
27824 53320266461 Power Supply Pistol Pete United States flag United States
36133 X150002 Playfield Mike Goode United States flag United States

This section lists any known information about how to physically find serial numbers on games created by this manufacturer. For all manufacturer tips, please visit the Serial Tips Page . (Please do not post serial numbers here on this form.)

Posted 6/29/2007 12:22:32 PM by Jess Askey
On Bally games from this era, there are serial number stickers everywhere. There should be one on the front of the cabinet under the coin door, one on the back of the cabinet on the model sticker and I believe there is one on the top of the backbox as well (this is a good one to look at if the others are damaged). Also, all the game printed circuit boards have the original serial number on them as well.
Posted 11/30/2008 10:30:39 AM by Steve fisher
also look on the power pack
Members can submit new tips on how to find serial numbers! Sign up for a free membership here!

This game has the following serial number formats defined in the database. As serial numbers are sumbitted, trends are recognized and defined or information about a serial number format is collected through historical information.

TypeExamplesRegExMaskLowerLimitUpperLimitAutoAssignable
Production Game 51420145671, 50220191701, 50020075181 ^(5[0-9][0-9]20)(?<sortdata>[0-9][0-9][0-9][0-9][0-9][0-9])$ True
Playfield serial number 061402, 151352. May or may not match game sequential serial. ^(?<sortdata>[0-9][0-9][0-9][0-9][0-9][0-9]) False
International Game 53320I267701, 53320I263241 ^(5[0-9][0-9]20)(I)(?<sortdata>[0-9][0-9][0-9][0-9][0-9][0-9])$ False
Experimental Game X970001 ^X[0-9][0-9](?<sortdata>000[0-9])$ False


The Serial Bot Summary information here gives a detailed explanation of the Serial Bot analysis for this specific game. The theory behind the Serial Bot is this...

Every game has many many serial number submissions, the goal of the IPSND is not to guarantee that *all* information is 100% correct but that over time, the system should automatically devalue inaccurate submissions while increasing the value of correct submissions.

You may click on the SerialBot score of any submission to see how it was calculated.

SerialBot Color Codes:
- Not Validated The serial number submission has not yet been validated by the submitter via email.
- Unknown There is no known information on the serial number format for this game yet. As more submissions are received we can start to make a best guess on the serial number format.
- Good If a serial does not fail any of the tests for a status of Warning or Bad, then it is good.
- Suspect A serial will have a suspect status if the format is technically correct but there is something wrong with the data. Examples might be that the number might be too high or low for the known range of serials for this game.
- Bad If a game has a serial number definition mask defined for it, then a serial may be marked as 'bad' if the number does not validate agains the mask. Masks are created for games by looking at known serial number formats and consist of a regular expression to define the format of a game serial.

SerialBot Scores:
1 Point Awarded if the serial number has a game assigned to it. This autoatically makes submissions with a known game more valuable than submissions without a known game.
1 Point Awarded if the serial number has been 'verified' by the submitter. A submission is 'verifed' if the submitter clicks on the link in the email sent to them for each submission. The basis for this rule is that submissions by people that do not take the time to respond to the email might be entering garbage data and/or giving fake email addresses. However, it is common for 'verification' emails to get stuck in spam filters etc, so, members may have 'verification' emails re-sent at any time.
1 Point Awarded if the submitted serial number matches one of the predefined serial number masks for this game.
1 Point Awarded if the serial number was marked as 'Physically Viewed' during the submission process. This is an interesting distinction as there are many times that serial numbers are submitted off owners lists, Ebay auction, etc. While these serial numbers are valuable, they may also be innacurate. In comparison, Physically Viewed serial number submissions are numbers that the submitter has actually been in front of the machine reading the number and then submitting it. Since it is more likely to get a good visual from a physically viewed machine, this gains an extra point.
1 Point If a photo is uploaded with the serial number submission. The submission automatically gains an additional point. Be aware however that this opens the submission up to 'Nudges' by members where even more points can be added or subtracted based upon the quality and accuracy of the photo.
-3 to +3 Points Members can 'Nudge' every sumitted photo once and give it an extra boost of 1 point or take away 1 point depending if the photo matches the submitted serial number. While any number of members may nudge a serial, the nudging can only affect the score by +/- 3 points in either direction.

The following map shows the locations of all serial numbers that were submitted with a geolocation... (click here if map does not show)

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