Very rare, but it does exist

The SY 6BB by Soyo is an AT form factor slot 1 board. I doubt you'll be able to run a very fast proc, and a 133 FSB is out of the question. It was in my old MCM catalog. It runs the 440BX chipset though, so it's set for the 100 FSB. It also has an AGP slot. If they still have it it will be part # 83-8165.

Just checked. it's been discontinued.

Amptron also made a similar board, but no luck finding it either.