unity said:

As for the one you just acquired, compare the serial on the front with the model number on the back with the regulatory label. They should match. If not then its a regular Macintosh that was upgraded. Official Apple upgrades came with new regulatory labels and badges. But they were not always installed.

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Unity - you were completely correct - I'm still learning a lot about the very early Macs. I've only ever seen non-Apple upgraded original Macintoshes. This one must have been an Apple upgrade as it has WP on the label on the back, but the serial ends in just P. The badge remains unchanged but it has the 512k version of the 128/512k board.

My other M0001P has nothing changed on the outside, just the non-Apple memory upgrade. I also have a spare original logicboard with an unofficial 512k upgrade too.