Help with Gold Plated Part Identification

I've tried to find out what this unique piece is, at a loss to what it is or if it is even for electronics. I tested it with the gold kit and if you look at the bottom left you can see a slight orange round spot where I used 18k. The pin is gold plate and held on by a ceramic washer. The outside I believe is ceramic, slightly rough, not smooth like porcelain. I used a Pentium CPU with heat sink still attached as size ref. I found this while walking in the desert with the dogs. There were a couple of old boards and a Military metal board within the same area. Don't know if they matter to help with ID Would love some help figuring out what this is. Thanks.







Unknown
Unknown Back Side
Unknown Size Comp