A prototype of a Macintosh IIcx

Seen on Reddit, a prototype of the Macintosh IIcx, known by the code name Avanti.

The (yellowed) prototype has no markings on the case, no labeling on the back, the motherboard indicates the code name, and the ROMs have a sticker reading “3 Stooges” (a famous American comedy troupe). It resembles this model offered on eBay in 2017.