the.com/mint marks
a tiny letter that snitches on where your coin was born.
means a small letter or symbol stamped on a coin identifying which mint facility struck it.
from ancient mints used marks to hold engravers accountable for weight and purity; the practice survived into modern coinage as a way to track production across multiple facilities.
no mark meaningphiladelphia coins often carry no mark at all
error coinsmissing mint marks can make coins wildly valuable
location variesplacement moved from reverse to obverse over decades
for instance
s mint coins — san francisco mark denotes mostly proof coinage today
cc coins — carson city mark on old west silver dollars