Constantinopolis with VICTORIA reverse from Rome

[Victor]

here is a fairly rare type

Constantinopolis
Commemorative
A.D. 337- 340
CONSTANTINOPOLIS; laureate, helmeted, wearing imperial mantle, holding scepter. 
VICTORIA AVG; Victory stg. on prow, holding wreath and palm. 
in exergue R ✶ E
RIC VIII Rome 31

[Valentinian]

When I found mine in a dealer's hoard in 1989 I was very pleased, especially because I bought four Constantinian coins from the hoard and this one was reckoned as a normal CONSTANTINOPOLIS. I have not seem many offered since then, although Victor has the one above on vcoins now.