mintmark

[ mint-mahrk ]
/ ˈmɪntˌmɑrk /

noun

a letter or other symbol on a coin that identifies the mint at which it was struck.

Origin of mintmark

First recorded in 1790–1800; mint2 + mark1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019