The attribution looks OK to me.
An assarion in this condition can be found in a dealer's junk box for around $10.
To find a dealer that would have a junk box with ancients: First you have to find a dealer who normally deals with them. I am fortunate in this regard, I know two such dealers.
If you don't have any reference books on ancient coins, that leaves you with the keyboard to find out what you need to know. Fortunately, there a few forums on ancient coins around the World, but there is only one forum that I post on: right here, in the CCF!
For market current market values on ancient coins, I would suggest that you have a good look at the VCOINS site.
I think reference books are better, but there is always the cost factor.