I just added another mint to my Constantius II fel temp with Christian symbol subset collection: Heraclea RIC VIII 69. But I'd like confirmation of the Officina as "A", or "B". The whole coin: I now have 18 coins in this subset, each with differing shape of Cross, Tau-Rho, or Chi-Rho; from a total of 8 different mints: Alexandria, Antioch, Constantinople, Cyzicus, Heraclea, Nicomedia, Rome, and Thessaloniki. It's not yet "in hand", but it's currently rolling its way (figuratively speaking) toward my mail box from across the Big Pond. Edit: I'm now leaning toward 'B'.