right place, right time
Signet ring?
@Davezilla Not sure it is meant to be used like that. But if I had the means to acquire this I would certainly ask the seller which materials would be safe to press my new caterpillar logo into.
https://mltshp.com/p/1PDWU
Intaglio (this stone cutting technique) rings were indeed used to make seals in hot wax in ancient Rome. A signet ring may also be solid metal.