This hypothesis is mentionned in the presentation
HISTORY, under the year 275, ‘The campaign in Raetia…’ end of § 1, of the revised online
RIC V. Amongst other facts the invasion of 275-6 in
Gaul could have explained a move of the
mint from Lyons to
Arles for
security reasons. But P.
Bastien mentionned that Lyons could have been at least as safe as
Arles because of its city walls and that various numismatic elements (continuity in
style and legends, die links) make such a move very improbable. The meaning of the A
mint mark remains however uncertain.