Super rare for the Super NES:

EPROM based testing cartridge circuit board for the SNES

http://cgi.ebay.ca/ws/eBayISAPI.dll?...m=150528868416

This thing is official, manufactured by Nintendo. I have had this in my possession since 1995. I am a former employee of Sunsoft and was mostly responsible for the horrible game Speedy Gonzales. I extend my deepest apologies to all who subjected themselves to its ludicrously long "loading times" between levels.

I'll try to come by if you post any questions here, or contact me via EBAY. Normally I don't frequent this board very often.