I've tried several bid sniping services, and found gixen.com to be the best. There's no computer required, as they place the bid from their server.
If it makes everyone feel better, when I emailed the seller to see if this board was definitely AT, he said that he wasn't sure and added "what you see is what you get." It would have sucked to pay the AT price for an XT board, although it looks like this one went cheap enough either way.
It's is, and works with modern systems with a ps2 converter. I have one. The clue and what tells you is #1, the format. The xt f has the number pad merged with the normal keys, and has a vertical return key. The at has the large return key and a separated number pad.
#2, and the biggest clue. The little plaque in the upper left says, "personal computer AT".
Nice board. I used one of these for a long time in the 80's and thought it was the best board ever made, until I found siig minitouch's and alps keys.
There are two big problems with this board though. It takes a lot of power, and doesn't work well with a usb adapter from what I've found, and the keys are extremely narrow, although you can get used to that. lol
