Letters and symbols used for workshop numbers       Letters commonly found with
GREEK
GREEK
LATIN   
Symbol
mint designation and workshop
1 A 11   1A 1   P     P     I 1   Star L Fifty
2 B 12 IB 2 S B II 2 Branch LX Sixty
3 Γ 13 3 T T III       3 Dot M Moneta (mint)
4 Δ 14 4 Q     4 Wreath PS,PV    Pvslatvm (pure silver)
5 E 15 IE 5 E     5 Thunderbolt OB Obryza (pure gold)
6 S 16 IS 6 S     6 Crescent SM Sacra Moneta
7 Z 17 IZ         7 Dot within crescent XCVI Ninety-six
8 H 18 IH P Pecunia
9 Θ seldom used    19 IΘ seldom used
10   I 20 K
    21 KA
Note: The letter "S" used for the 6th officina in the Greek system should actually a be "digamma(wau)" which looked something like this: and was the equivalent of the Latin "F". The Greek "stigma" is often shown, which is incorrect as it did not exist until medieval times.