According this site, the later 65/85/95 models were introduced in 1982 (although I believe this is from 1983 or later, see the photos of the typewriter controller below). After watching a video of a disassembly of one, I had a hunch they had capacitive buckling springs; after some eBay snooping I was able to land a Model 95 keyboard assembly for a reasonable price:
I was happy to see it was definitely a Model F! I hope I can get it converted. Some interesting features of the keyboard:
- Plastic barrel frame with melted rivets, predating the Model M!
- Latching Caps Lock
- Slip-on controller
- Rubber O-Rings on most barrels, like some Wheelwriters
- Stepped, unstabilized wide keys