I've skimmed through almost half the thread from the beginning, through the loss of the attachments way-back-when, then switched to careful use of Google, and there are a couple that I'm having trouble finding.
One that's kind of specific...a Unicomp-manufactured, IBM-branded white M13 (logo grouped with the LEDs instead of in the oval spot). Bit of an oddball. Unicomp said they don't think they even made it, but I believe otherwise.
Reference photo.
These, I know existed but I don't think any good links to them exist anymore (or my Google-fu is off):
XT Model F
IBM M5-1, reference photo can be found
here (mine is dirty and in pieces, so not a good photo candidate)
122-key Model F
And then one that I'm pretty sure nobody made (maybe): 4704 50-key,
reference photo. Could probably start with the
62, 77 or 107 if those exist.
Any guidance towards finding those, or someone willing to make/remake them would be much appreciated