G81-1000HBE/10 : https://imgur.com/a/Cj9IJji
1600 series keyboard in Cherry's own brochure : wiki/File:G80-1600.pdf
But these caps are seen on Chicony and Monterey boards :
- For Chicony, here are a few exemple of keyboards with keyboards that have similar keycaps :
wiki/Chicony_KB-5161#KB-5161C_Mitsumi_r ... l_switches
viewtopic.php?t=504
https://geekhack.org/index.php?topic=72837.0
https://geekhack.org/index.php?topic=88566.0
- and Monterey keyboards :
wiki/Monterey_K101#ALPS_SKCM_White_variant
https://geekhack.org/index.php?topic=69285.0
... so I imagine these caps were cheaper to buy for Cherry than to make their own keycaps
I also imagine that the O is something along the lines of "Variation #X for the G80 series with MX Blues". But this is much deeper in the rabbit hole than I'd like this post to be, and I don't want to ramble on stuff I am not sure of
Spoiler: