Hm, maybe an odd layout Beam Spring board?
Really I just want to marvel at this IBM collection. I now know that the IBM land is apparently in Georgia .
Welcome to GeekHack. I'm sure all the IBMHeads will love your pictures .
All beam springs are odd layouts.
That is most definitely a beam spring KB for an IBM 3276 terminal (the 3275/3277 KBs are much larger on the top:
here's a picture). Made in Canada in the late 1970's. Now usable on USB with Xwhatsit's controller.
I think its 3278: doublechecking now. It's the 3270 layout and size.
Edit: 3276, similar to dedalus's data entry beamspring.
http://deskthority.net/photos-videos-f8/ibm-3276-data-entry-keyboard-t1113.htmlFirst image upper right. square label IBM model M 1390120. Front left appears to be an IBM 122-key model F (check for the black bottom pan) 611034* or 6110668 Those are worth money. There is one upside down on the "a10D" shelf that you can clearly see. Two more on the "a8F' shelf
I also see (on the 42H0468 shelf) a "model C" keyboard. This uses "model F" technology, but is not desireable (horrid layout, etc.) still they are nice keyboards. Two more on the left in the picture preceding "question 1".
Lots and lots of 1390120 keyboards. These aren't as sought after as the F 122 key, but are very nice and currently in demand.
Lots of 122-key model M keyboards. These are some what common and less in demand, but still very nice.
The cheapest KBs are probably the terminal Ms. the + ont eh tenkey (numberpad) is split and they have a modular connector you can see one as the second from the left KB ont eh a10c shelf.
Lots of POS kbs: rubberdomes, not very nice to type on, no-one wants them. You have some examples on the a9b shelf.
Yellow kb above the 25f6350 tag appears to be an NMB terminal board: not too nice. The one next to it seems familliar: I will ahve to see better pictures
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My recommendation:
sort them by generation. The normal size M's by label (square is the oldest, then beige oval then blue oval) Sort out the F122's and other model F's. Throw away the cheap POS stuff.
If you ahve any questions about a specific model, please ask here.
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edit: you live very close to another GH'er who knows a lot about IBM model F keyboards. Perhaps invite him over and chat!