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Right, there’s no serial number on the bottom, so it must be official upgrades on both. Interestingly the logic boards on the upgraded Plus machines are different from regular Plus machines that I have: the serial ports have black plastic inside instead of the regular white. This would indicate...

Thanks, it actually neither says M0001 nor M0001W, I’m attaching some pics. On a different note, I find it interesting how these are different from one another…

I have two Macintosh Plus machines with the pre-Plus front. Is there any way of knowing if these are upgraded 128k or 512k machines? The back and the logic board was of course replaced in the Plus upgrade, but was the front or the analog board any different between the 128k and the 512k?