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Museum of the Game® & International Arcade Museum® Forums
Maybe this got posted before but I'm not gonna look, if anyone has a williams game that was converted you can use this site to see if for example it's a bubbles or sinistar, or etc..
Example: serial number begins with 621, bubbles... 618, 620, 624, sinistar..
Not full proof but could give some info to those with williams cabs that have been converted again and again like robotrons and jousts. (btw the serial number is stamped to the right of the coin door in most cases)
Have to scroll way down 4/5th's of the page for the vids, but it's got provided serial numbers and pics of pcb's and cabs of ALL williams games, splat, blaster, mystic, joust, joust pin, rat race pin.. , and everything else.