Mint Marks & Officinae: Reading the Control Marks
During the later Roman Empire (3rd–5th centuries AD), every coin was stamped with a mark in the exergue — the small section beneath the reverse design — that revealed the mint city and workshop (officina) where it was struck. These marks are an invaluable research tool.
The Exergue
The exergue is the lower segment of the reverse, separated from the main design by a horizontal line. It typically contains a mint mark composed of two or three elements:
- Mint letters — abbreviation of the city name (e.g. ANT = Antioch, LVG = Lugdunum/Lyon, CONS = Constantinople)
- Officina number — indicating workshop number, usually in Greek (A, B, Γ, Δ…) or Latin (P = Prima, S = Secunda, T = Tertia…)
- Field marks — additional symbols or letters flanking the main design, sometimes indicating issues or batches
Major Mint Cities
- R (or ROMA) — Rome
- CONST (or C) — Constantinople
- ANT — Antioch
- SIRM — Sirmium
- SISSCIA — Siscia (modern Sisak, Croatia)
- LVG — Lugdunum (Lyon, France)
- ARL — Arelate (Arles, France)
- TR — Trier (Germany)
Why It Matters for Collectors
Identifying the mint of a coin helps date it, understand its context, and assess rarity. Certain mint/officina combinations were struck in small numbers — making a TR officina coin potentially much rarer than the same type from the Rome mint.
Cross-referencing mint marks with resources like the online Roman Imperial Coinage database (numismatics.org) or Wildwinds allows collectors to pinpoint a coin to within a few years of its issue.