Those are
DECword (a.k.a., WPS) keycaps. The gold key is the dead
giveaway -- WPS used that as a command prefix, similar to the way TECO
and Emacs use ESC.
Yep... also EDT uses "PF1" a lot, but it was only called the "Gold
Key"
in WPS instructions.
EDT calls it the "Gold Key" as well. For example on the AV-J756A-TC "EDT
Editor Reference Card" I have sitting here on my desk it talks about the
Gold Key on both the VT52 and VT100. Still true for EDT on OpenVMS 7.3-2.
Zane