Hi again,
I've been trying, without success, to find a reference for this coin. I'm not familiar with tetrarchic pre-reform coinage, though, so it's quite possible I am missing something completely obvious. The closest match I have found is RIC V:2, 216 (Ticinum). This specimen has a different obverse legend (including alfoldi).
IMPCCVALDIOCLETIANVSPFAVG Radiate and cuirassed bust right.
HERCVLICONSERVAT Hercules standing left, right arm on club, lion's skin on left arm, holding bow. SXXIT in exergue.
3, 28 g. Max 22,5 mm.
Any suggestions would be appreciated.