Originally posted by woof There are subtle differences that give the early bodies away... differences include cosmetic differences in the self-timer lever, meter switch, top cover attachment method, and film counter height. There are also subtle differences in the focusing screen, lettering font, and even the strap triangle rings. The early part number was 231. The later model part number was 23102. Some appear to have these numbers on the baseplate, but not all. Serials can distinguish them as well... serials starting in the range 10nn800 but lower than 2016000 are early, while 2016000 and above are late models.
Just to confuse the issue, I have a hybrid early/late Spotmatic.
It looks like a later model; lower profile film counter, top plate attachment method, self timer lever, meter switch and (the icing on the cake) 23102 stamped on the baseplate.
However, the serial number is 1443403 (stamped in the earlier font) and there's no roller inside the film door - as per the early version.
Which I guess means mine was made around the time of the changes from whatever bits were laid to hand...