Constantine I VLPP from Siscia

[Victor]

RIC only lists workshops B, Γ, and E for RIC 56

Constantine I
A.D. 318-19 
IMP CONSTANT-INVS AVG; high crested helmet, cuir., spear across r. shoulder, shield on left arm 
VICTORIAE LAETAE PRINC PERP; two Victories stg., facing one another, together holding wreath inscribed VOT PR on altar. 
in ex. ΔSIS 
RIC VII Siscia 56 

[Lech Stępniewski]

After magnifying the picture I see dot in mintmark, like on SISCIA 61.

[Victor]

There is no need to magnify it, what you are talking about is perfectly visible; but I don't believe that it is a dot, though I could very well be wrong. The first thing that I did was compare this coin with Siscia 61 which generally have a clear dot that is usually closer to the rest of the mintmark and a bit higher. Below are some example for comparison. In hand I will be able to confirm what it is, but my first impression was that it was not a dot. I might also be able to determine RIC number just by the flan, though sometimes it is not so easy. RIC 56 flans are a bit smaller and thicker than RIC 61. When I get the coin I will post better pictures.

[Lech Stępniewski]

RIC 56 flans are a bit smaller and thicker than RIC 61.

Interesting observation. Thank you, Victor, for the explanation.

[Victor]

Here is a better picture of the coin and it is clear that there is not a dot in the mintmark. It's just a small break in the sand patina showing the darker patina underneath.

[Lech Stępniewski]

Much better picture. Thanks! What is the weight and the diameter?

[Victor]

Sorry, I forgot all about that.

19mm   3.4gm