JIAAW, Harkness Collection
RRC 448/3, ROME, 48 BCE, 3.99g
On the front, or obverse, of the coin you will notice a small “T” which has been pressed into the face of the woman. This symbol was not a part of the design, but an ancient mark made by a banker to demonstrate that the coin had been tested for purity (or silver content). These “banker’s marks” served simultaneously to test the coin for silver purity and to identify the banker who had tested the silver, providing future users of the coin with some measure of confidence in its value.
– Jacob Weber ‘15, student in ARCH 1575 Lost and Found: Coinage and Culture in the Roman Empire
Learn more about coin C034.08.06 and see other examples of coins with banker’s marks: