It's just the manufacturers cutting corners . . . ![whistle #@#](http://www.aussiepinball.com.au/Smileys/classic/whistle.gif)
OK, now that was funny!!
![lol :lol](http://www.aussiepinball.com.au/Smileys/classic/lol.gif)
Not sure in regards the actual question, could be as you mentioned for different markets, or as B/W had several suppliers of cabs and playfields, they might also have had several suppliers for these with slightly different designs?