Gallienus, Mediolanum mint, officina 2, 264-265 AD.,
Æ Antoninianus (ø 18-20,5 mm / 2,74 g), silvered bronze, axis irregular alignment ↑↖ (ca. 320°),
Obv.: GALL[IE]NVS AVG , his radiate head r.., one ribbon behind, one forward over shoulder
Rev.: PA[X AV]G / S , Pax walking left, holding olive branch in right hand and transverse sceptre in left, offficina letter S just below branch in left field.
RIC V, I, p. 174, no. 501K var. (listed only with S in exergue, not in field) ; Göbl 1222c ; cf. Coh. 741 .
http://numismatics.org/collection/1944.100.30369