I will ake some photos as soon as possible!

It was always clear to us! LOL No 512K ever had a SCSI port.

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Well, some obscure online auction sellers are sometimes manipulating old stuff in order to achieve higher rates. Although not very "popular" it might have been possible that this Mac is a physically downgraded Plus with the faceplate from an "out of order" 512k. Plus Macs are much easier to find nowadays...

Not sure what you mean by "misses any further engravings".

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For example: the small circle of production months stamp. European Macs sometimes bear special markings from some non-Apple companies that tested those machines in operating security aspects - but these markings are missing.

When you say "held in black", so you mean the metallic RF coating on the inside of the case is "black"? If so, I have seen compacts where the shielding coat is so thick it conceals the signatures, but if you look real closely you can still make out a few."

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The RF shielding foil just covers the back up to the top of the connection ports, it doesn't reach the top of the housing, so it doesn't cover the signatures in my Plus which are placed on the plastic housing itself and not on the shielding foil. It's the plastic housing itself which misses the beige color. To me it looks like this housing just got the paint's grounding on the inside but wasn't colored beige afterwards (I know that the beige color wasn't sprayed onto those housing parts, Apple colored the plastic itself - it's just a description to give You an imagination until my photos are made).

You are better off repairing the Plus board and switching it to the 512K case if you prefer its design.

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As long as I don't know --- exactly --- what to fix where (I just heard something about Pin 1 re-soldering) I'm simply not able to fix my Plus

J