Saw these on ebay and thought I'd post pics...





New old stock electrical outlets.

Circle F brand was very popular in the area I live in. They were still in business in the late 70's early 80's. I took out a lot of those two prongers back when I rewired houses, some had 15¢ price stickers still on them.

Circle F became Sylvania Wiring Devices & then part of Challenger Electrical Equipment Corp., what became of it after that.......

I note that they are polarized for the parallel-blade configuration.