Official Roman coins from about the 4th century onwards show
clear mintmarks
indicating the city where the coin was minted, also often the officina
(workshop) that minted the coin.
Also there were many local mints. Most cities in the East and many
in the West, especially in Spain, minted local coins. In the West this
ended with Caligula, in the East local mints continued their activity
till
way into the 3rd century.
Many variations are known.
Official Roman Mints with most common mintmarks, many variations of these marks are known. Please note that some mints like Colonia Agrippina do not present any mint marks
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Some examples of official Roman mints with fotos below:
Antiochia, 5th officin, ANTE
Colonia Agrippina, (Köln in Germany), no specific
mintmark, but
Victorinus is thought to have minted this coin at this city
Mediolanum, M D COM
MD PS = "Pure
Silver" from Mediolanum
Rotomagus, known for this type under Carausius
Thessalonica, 5th officina, SMTSE (Sacra Moneta TS E)
TES
for Thessalonica
Treveri, TROB (pure Gold from Trier, Germany)
TR = Trier