Mint organization is an interesting thing, and challenging to research, since we have absolutely no written evidence but only the coins. At
Thessalonica, for example, the coins for
Constans as
Caesar, both with two and with one soldier (
RIC 201, 225, and 226), are listed in
RIC from
officina Delta exclusively. Yet some months ago I managed to get a very nice
RIC 201 from off. Gamma, thus even here with normally strictly separated
officinae, some exchange must have taken place.
Rupert