Those pins were from an early type of PCB edge
connector. They were quite nice
in practice, and somewhat novel in that it's a unisex (hermaphroditic?)
design: they mate with another pin of the same shape (the mounting area
differs, but not the mating area).
I've just been using EDAC516 series connectors [1]. The pins in those are
hermaphordticv, They're fork-shaped, and fit together cross-ways.Of
course the housings hold them in the approprtiate orientation. And yes,
the pins I was using are gold-platedm but not solid gold
[1] I needed a connector with 80 or so pins for the HP BCD interfaces.
Other requirements were that it was robust, easy-ish to wore to a cable
(so no 0.8mm inter-board connectors :-)), and likely to have been used
for computer applications 30 uears ago. Since EDAC 516 connectors were
used on the DOcumation card readers, I think they fit the bill :-)
-tony