Looking through my grandmother's "lower end" jewelry, I stumbled upon this 10K gold ruby pin with a patent number that has left me a little confused. The engraving on the lock seems to read, "PAT 5-17-10."
I've searched the patent database. The number had been given to a gate lock in 1856. Why would this be showing up on a lock for a pin? And would it say anything towards its age?
Any input, insight would be very much appreciated.
Best wishes,
Stephan