Diocletian Field Marks

[stupot]

Intrigued by these marks on reverse. i assume the XX is a value? Other side unsure Greek characters. There's certainly a lot to these coins.

[Victor]

XX I is most likely a value mark; which probably means 20 parts bronze to 1 part silver. The gamma is the workshop; Alexandria had five workshops at this time-- A, B, Γ, Δ, E