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.

Reasonable bargaining is appropriate.

Roman Imperial

Salonina. Antoninianus. 257-258 AD. Rome. 

Obv   SALONINA AVG, diademed, draped bust right, on crescent.

Rev.: IVNO REGINA, Juno standing left, holding patera and sceptre.

(Ric-29). (Rsc-60).