Hello E-one, This coin needs some clean up, and I was unable to identify it as it is now. If anyone can pinpoint it, I would appreciate it. Thanks
It's a Gloria Exercitus ("Glory of the Army") type from Constantine the Great or one of his sons. It looks like a television on a pole, but it is a vexillum, a military flag that's held between two soldiers. See here on Vcoins.
Looks like it was minted in Arles (SCONST mint mark?). Pellinore is correct about the reverse type. The obverse inscription is unbroken, so it's not Constantine the Great; it's either Constantine II, Constantius II, Constans, or Delmatius. I don 't think it's Delmatius since it looks like the letters CON appear at around 9:00. So that narrows it down to one of CtG's three sons. It's not Constantine II, however, since his inscriptions begin with CON, and there appear to be too many letters in the inscription for Constans, so that leaves Constantius II as the most likely candidate. Check the last 3-4 letters of the obverse inscription. Do they look like NOBC or AVG? NOBC would place it before Constantine's death in 337, IMP after. Is that an "X" or a Chi-Rho in the flag? A Chi-Rho would also place it before 337; but an "X" could be either.
Gsimonel, It is still not readable to me. I can only say that inside the flag is a symbol an not an X. Here are few more photos. Maybe someone will see more than I do:
Depends which is more important to you - a nice patina or a positive ID. My guess is if you zapped it you would be able to get a positive ID, but you'd lose the patina. You might be able to get off enough encrustation with a brass-bristle brush to read a bit more of the inscription. That wouldn't hurt the patina.