steampunk vintage scrap hardware lot, industrial gold plated hex nuts

Large lot of assorted small vintage hex nuts from an amateur electronics enthusiasts' estate. These hex nuts were out of his stash and the small box they were in was hand labeled as gold plated. There are about 170 nuts total: 80 nuts that measure 0.370" across the flats; 70 that measure 0.305" across the flats and 20 that measure 0.336" across the flats.

These would be industrial gold plated for securing a good electrical contact on terminal studs. The base metal is brass (non-magnetic and yellow where we scratched one). The color and tone of the nuts looks right for gold plating to us, but we are not sure.