Valentinian I- SECVRITAS REIPVBLICAE

Valentinian I, 25 February 364 - 17 November 375 A.D.

Obverse
D N VALENTINI-ANVS P F AVG, pearl-diademed, draped and cuirassed bust right

D N VALENTINIANVS P F AVG

D N: Dominus Noster, our lord
VALENTINIANVS: Valentianus
P F: Pius Felix
AVG: Augustus, emperor

Reverse
SECVRITAS - REIPVBLICAE, Victory advancing left, wreath in right, palm frond in left
Across field: * / P left, M right

SECVRITAS: Security
REIPVBLICAE: Republic


Bronze AE 3, diameter 16.5 mm

The exergue:
ΔSISC, Siscia Δ= Delta fourth Officina gamma
ΓSISC, Siscia Γ= Gamma third oficina
Minted year: 24 Aug 367 - 17 Nov 375 A.D

Comment:
Mint is Siscia, but I cant make out the exe:
ΔSISC, Siscia Δ= Delta fourth Officina gamma
ΓSISC, Siscia Γ= Gamma third oficina

looks like Mintmark XVII on ric 9 page 141.
in the footnote he says he s noted a Β SIS.
it could be a ε SIS , which would make it a not in RIC