The ones at the end of B/W, CC in particular has shallow code. Possibly IJ undersized servo for the POA.

Not sure why it was done but the later NBAFB playfields have a hole for electrical harnessing to fit through to power the scoreboard area. The earlier playfields do not. Cost or better design, maybe George Gomez can tell us....I am swapping out my original early NBAFB playfield with a later NOS playfield and will have to deal with the playfield difference I mentioned.BTW I first learned of this on a Todd Tuckey you tube video.

Thanks. The source just explains that the difference exists. Still not sure why the playfield changed. Was it for cost? I'd say probably not for cost as there are 2 holes and one is unused, that seems more costly, having an unused hole. Wish George Gomez would chime in.