
Above: front view; note Mode key between left Strg and Alt instead of 3500's Repeat. Below: back label with FCC ID.

Full gallery: http://imgur.com/a/TXZUq
So a) there appears to have been another original-style Mouseboard, and b) this seems to be a reused model number - very unusual for Cherry. (Fortunately the later MX-Board 3600s have five-letter codes, so it's fairly easy to tell the two 3600s apart.) I also wonder how this is different from the 3500 - the difference in model number suggests there's some relatively significant difference. Controller revision, perhaps, with a change in functions to explain the change from Repeat to Mode.
Anyone seen one of these before?