For completeness I checked out a few other references that are usually relevant to late-Republican
provincials:
Coinage in the Roman World in the Late Republic (BM conference 1987); Coinage and
Money under the
Roman Republic (
Crawford);
Coinage and Identity in the Roman Provinces (Howegego etc). Nothing on these issues.
But I think I found an answer, in an odd place - my own website! It has a brief piece on these issues:
http://andrewmccabe.ancients.info/Provincial.html#LampsIt goes into the C.G.I.L. and legends used on these issues and concludes that the end of the
legend can be expanded to mean "Q. Lucretio, L. Pontio, Duovirs, first Colony founders". Thus, by implication, these issues, if struck by the first duovirs, would have been struck in the first year of the colony i.e. 45BC. I seem to have used
FITA as a main source, but, regardless what
FITA says elsewhere about dating, if the legends explicitly say that the issue was struck by the first Duovirs that founded the colony, then it must be 45BC.
Well done again for your amazing felicity as a
sharp eyed kid!