Constantius Potin Tetradrachm - Year 1
Jul-09-07
US $24.50.

The surface is mostly nicely toned,  with clearly-visible 
details,  but with medium-fine and very fine granularity in 
the "crevice" areas.

It was attributed by a previous owner as a billon tetradrachm 
of Constantius I,  minted in year 1 (293 AD) at Alexandria.  
The reverse is Elpis (Spes),  walking left,  holding a flower. 
 "L" and "A" in the field.  The online sources say the type is 
correct,  but that it's probably made of potin (i.e.,  the 
Romans had stopped adding any silver to their "silver" coins 
by the time this one was minted).

The actual diameter of this coin is about 19mm,  and it's a 
bit less than 4mm thick.