I've had a request from a friend for a game cartridge for "the very
first Atari Home Entertainment System, you know, the one with the
wood grain?".

The model number of the hardware is unknown, but it was purchased new
"in 1985 or so". The friend is looking a Chess game cartridge.

Does anyone know who to talk to to find out where this cartridge can
be found, if at all?

Thanks,

Lar