Roman Imperial mint marks have been found for the following cities:
Alexandria in Egypt (Coin mint marks: A, AL, or ALE)
Ambianum in Gaul (Modern day Amiens in France; coin mint marks: AMB or AMBI)
Antioch in Syria (Of Biblical fame; see the Book of Acts. Coin mint marks: AN or ANT)
Aquileia (located in modern day Italy; coin mint marks: AQ or AQVIL)
Arelatum in Gaul (Modern day Arles in France; coin mint marks: AR or ARL)
Augusta Trevirorum/Treverorum (Modern day Trier in Germany; coin mint marks: TR or TRE)
Camulodunum in Britannia (Modern day Colchester in England; coin mint marks: C or CL)
Carthago (Carthage in modern day Tunisia; coin mint marks: K, KA, KAR, or KART)
Constantinopolis (Constantinople or modern Istanbul in Turkey; coin mint marks: CON, CONS, CONST, or KONST)
Cyzicus (Located in modern day Turkey; coin mint marks: CYZ, K, KY, KYZ or KYZ)
Heraclea in Thracia (Coin mint marks: H, HER, HT, or HTR)
Londinum (Modern day London in England; coin mint marks: PLN)
Lugdunum (Modern day Lyons in France; coin mint marks: L, LD, LG, LVG, or LVGD)
Mediolanum (Modern day Milan in Italy; coin mint marks: MD or MED)
Nicomedia in Bithynia (Modern day Izmit in Turkey; coin mint marks: N, NIC, NIK or NICO)
Ostia (Harbour city of Ancient Rome; coin mint marks: OST)
Ravenna in Italy (Coin mint marks: RV or RAV)
Roma (Modern day Rome; coin mint marks: R, RM, ROM, or VRB)
Serdica (Modern day Sofia of Bulgaria; coin mint marks: SD, SER, or SERD)
Sirmium in Pannonia (Modern day Sremska Mitrovica in Serbia; coin mint marks: SIR or SIRM)
Siscia (Modern day Sisak in Croatia; coin mint marks: S, SIS, or SISC)
Thessalonica in Greece (Of Biblical fame; coin mint marks: TE, TS, or TES)
Ticinum (Modern day Pavia in Italy; coin mint marks: T)
Blessings!
Source
Guide to Ancient Coins. The Coin Collector Series Number Eleven. Walter Raymond, Inc., 1950.
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