Today I' facing a rather unusual Mac which I won within a non-eBay auction. The front housing of that Mac clearly identifies it as the 700th 512k Mac manufactured within the 34th week of 1984 (regarding the aerial number decoder online) - the sticker and the front housing are definetly original meaning a possible "Plus" badging wasn't rubbed off that front housing which normally leaves clearly visible hints when removed.

But...

The back of the housing is definetly a "Plus" one as it carries a SCSI port (which to my informations is missing within a 512k). I haven't had the chance until now to fire up that machine with a Mac OS so I'm still lacking any further information. I aslo know that Apple once provided a "Plus" upgrade for the 512k which consisted of a "Plus" mainboard and "Plus" back housing exchange but the back housing sticker is missing (besides this the typical Apple logo / Macintosh 512k marking on the back housing is missing, too).

Now...

Are there any more details which I can have look on to determine if this Mac really is / was a 512k one? If the mainboard was exchanged I suppose that the tube and the board (not main board) aside the tube are still original but I do not know much about details there so any hint would be very welcome. I haven't opened this Mac but I will do to compare it's mainboard with the "Plus" one I already owned before.

Thanks a lot for any information from the Classic Pros in here!

J