Inside the Mint or Officina

Many of the mints operated several different workshops (or officina) which can be identified from the Latin and Greek letters added to the mint name. PTR = Prima/first workshop of TRier mint. The following table shows how the workshops are numbered:

Greek	Latin	English
A / α Alpha	P prima	1
B / β Beta	S secunda	2
Γ / γ gamma	T tertia	3
Δ / δ delta	Q quarta	4
Ε/ ε epsilon	-	5
Σ/ σ sigma	-	6
Ζ / ζ zeta	-	7
Η / η eta	-	8
Θ / θ theta	-	9
Ι / ι iota	-	10
ΙΑ iota alpha	-	11
ΙΒ iota beta	-	12

The following letters were sometimes added to the mint abbreviation:

Initials	Latin	Translation
SM	Sacra Moneta	The Sacred Mint
Comment: Hence SMH is the Sacred mint of Heraclea.
PS	Pusulatum	Pure Silver
OB	Obryziacum	Pure Gold
Comment: These appear on late Roman silver and gold respectively.
COM	Comitatus	The Imperial Court
Comment: Normally appears with OB meaning pure gold of the Imperial Court (COMOB). This form appears on Late Roman gold.