Vintage Gold Filled Pocket Watch Chain Clasp Marked

Description

Out of my collection of 25 years. I wore it as a pendant. Husband had it before me in his watch collection. So do not know exactly when and where it came from. Or time/ era made.
It is marked 1/20 12k GF.
Has lots of character and use left.
Payment is due within 3 days of end of auction. Thank you.