I ask you to also look at the rest of the coins. Basically, these are rare or scarce coins, trial coins, coins, rare coins with stamp errors, etc. 

Roman Imperial
Gallienus, 253 - 268 AD
AE Antoninianus, Rome Mint
Obverse: GALLIENVS AVG, Radiate head of Gallienus right.
Reverse: PROVIDEN AVG, Providentia standing left holding globe and sceptre.
RIC580

This is an authentic original coin. Indefinite warranty from the seller.

The coin has passed all the necessary conservation procedures..

Reasonable bargaining is appropriate.

I ask you to also look at the rest of the coins. Basically, these are rare or scarce coins, trial coins, coins, rare coins with stamp errors, etc.