@niconiconi I have an unknown IC of that vintage, it looks remarkably like the top one (purple with gold stripe, the cap in the center is black though). I think it came out of a modem, probably from the PDP era.
It's in rough shape. I glued it to a holiday decoration as a teen. It's still got bits of craft glue and fuzz stuck to a couple of the legs 😁
the mastodon instance at cybre.space is retiring
see the end-of-life plan for details: https://cybre.space/~chr/cybre-space-eol