Valens AE3 id, not in RIC?

[Peppe77]

I have problems with this AE 18 mm, 2,68g coin of Valens.

Obv. DN VALEN-S PF AVG, pearl-diademed, draped and cuirassed bust r.
Rev. GLORIA RO-MANORUM, emperor advancing r. draging captive and holding labarum. M in left field *P i right field. BSISC in exe.

These mintmarks are listed for Valentinian under RIC IX, Siscia 14, but not for Valens. Is this known elsewhere? I can't find a match? Or am I just blind?

[Victor]

Valentinian is Siscia 14(a) and Valens is Siscia 14(b)