Hi Victor
Thank for your answer. I know that rarity of some coin in the RIC aren't true; I'm glad to know that this coin is rare.
I have also the coin of Constantine and also the VICTORIAE LAETAE PRINC PERP: they aren't in good conditions...
I know your website and the page about Christian symbolism: I have read it several time
In my opinion, it could be better consider these crosses without a christian meaning for some reasons:
1. Probably the first symbols are Chi-Rho and Iota-Chi in 319-320.
2. First crosses with a clear christian meaning appear during the reigns of Costantine's son, in some standards. But more significant crosses appear only during the Valentinian and Teodosian dinasty, replacing (with some exceptions) the old symbolism of Constantine's family (Chi-Rho).
3. Greek cross is an ancient and simple symbol to use as mintamark and there are other two coins with a greek cross: one under Maxentius and the other struck in London (it is difficult that these two coins were related to christianity).
4. Crosses in Ticinum can create doubts about their meaning, because in Ticinum there was an important christian community. But I think it is difficult that was the emperor to order to add these crosses. A decision of workers of the mint? I doubt it! Emperor could kill you for a cross near the Sol