This is what I can glean from the markings, they are my interpretations only and cannot be Guaranteed
E.2 could mean 1985
Eibar Proof House
S/N = FN183245
FN = ARIZAGA, IGNACIO (formerly GASPAR)
Bore Diameters 18.4mm
Chokes LH + = FULL, RH +++ = Half
Chambers 12G X 70mm (2 ¾”)
Proofed...