De hecho, tienes razón Chencho las palabras que me llevó a las preciosas tablas de Helvetica no está muy claro!
Pedí explicaciones ad Helvetica e Dane me respondió:
Hi Giuseppe
The coin is not in RIC with this obverse break
..CONSTA-NTINVS.
RIC VII London 156 does not list this CONSTA-NTINVS,
but only
IMP CONSTANT-INVS AVG (bust right)
IMP CONSTANTI-NVS AVG (bust left with spear)
IMP CONSTANTIN-VS AVG (bust left with spear)
I found this ...CONSTA-NTINVS... (bust right) coin
listed only in the book "Sirmium VIII", which is the
book listing all the coins in the Bikic-Do hoard. The
coin is listed there under the London mint, coin number 6.
So the only reference I have found for this coin is
Bikic-Do hoard, Sirmium VIII London, 6; RIC VII London
156 var (obv legend break).
best wishes