Constantine I ROMAE AETERNAE from Rome...helmet variation

[Victor]

I have seen a few of these helmets, but this is my first example. The second coin below is a typical helmet.


Constantine I
A.D. 318-9
20mm 3.2g
CONSTA-NTINVS AVG; helmeted and cuirassed bust right.
ROMAE AETERNAE; Roma std. r., shield in lap inscribed X/V, in fields P/R
in ex. RS
RIC VII Rome 146 var.

[Lech Stępniewski]

I have seen a few of these helmets, but this is my first example.

Nice coin! Would be great on my page but unfortunately RIC mentions in footnote 146 this variety as "the Athenian type".