Would it change how we thought about the career of Marcus Valerius Messalla, suff. cos. 32 BCE and patron of Tibullus if he happened as a young man to have made such an anti regal coin (RRC 435/1)? Messalla the patron and suffect consul was famously republican in character: it would be nice to have this as ‘proof’ of his early and outspoken leanings in that direction.
Syme thought they could be the same person (JRS 1995: 157), Crawford allowed it:
The Digital Prosopography of the Roman Republic notes it but does not take it as fact.
Wikipedia gives a nice summary of the man but takes it as fact his father was cos. of 61 BCE, only noting that there are other suggestions.