Awesome, thank you for sharing that. An unwatched plot never thickens! This one seems to tie it all together--old and new Monterey model numbers, K101/K102 case and model designations, and the K101/K102 case styles and keycaps.
Early Montereys had the K9AX style model numbers. So far I have K2, K7, K8, and K9 on record. The prefix seems to indicate case style and layout. The suffix letters were XT (XT only), AT (AT only), or AX (AT/XT switchable). Until now I had only one K9AX on the list, and it was an odd German version. Apparently the K9AX became the K101 (ANSI) and the K102 came after that, with BAE and the two added switches in the bottom row Later versions of the K101 probably used the blockers so the same case could be used on K101 and K102 models. Eventually the K104 version came out using the K102 layout but in a different case. (There was a K103 also, in a curved bigfoot-style case) There's probably more to the story still, but it's starting to make sense now.
So...the ANSI one first asked about is probably an earlier K101. Switches could be green or blue Alps, or possibly Mitsumi as used on other early Montereys.
Datacomp had a similar evolution with blockers, and the bold arrow keys used on the Montereys are a common Datacomp feature. Perhaps Datacomp made more than just the caps for the early Montereys?
Now what the heck was "Staff"? Was that a computer company that used Monterey keyboards, or was it a marketing name used to sell the keyboards separately in retail stores? There seem to be a lot of Staff-branded Montereys out there.