Even further back in ' the cave ' was this 512k with no rear case placard ( product description )

Also bottom of case has a rectangular depression molded into the case.

Pretty 'cherry' looking diskette entry and no signs of case forced entry. Haven't peeked inside yet.

Any ideas about this systems origin?

Please see my gallery titled "blank-512k"

https://68kmla.org/forums/index.php?/gallery/album/56-blank-512k/