bytheway, the IBM 3290 only was made with 2 different keyboards (as far as I know) one is the "space unsaver" model F 1387033 and the other is the 122 key model M. Ambry has some decent info on this.
Also, I've been after some wheelwriter keyboards for a while now, and I just bought two on ebay for minimum bid. I bid the first day and there were no other bids. They commonly go for about $50 BIN. Mine were $36 shipped for both.
I might be interested in trading the keycaps from my 3 different wheelwriter keyboards.
For me, it was the caps that I've only seen on F122s so far, and reading about 3290s coming with F keyboards...
Most 122-key model F's have stepped "modifier" keys around the spacebar. Nevertheless, there are exceptions, and they are hard to distinguish from an M from the top.
The 3290 is almost certainly easily repairable since it powers on and just needs that connector replaced. 'gratz to whoever won it!