Kingdom Thrace, Mesembria AR Diobol Helmet/ Wheel

Leonard:

To find going values is use munzeo a lot. Here is a link to a search of mesembria diobol. Of course this is going auction price in the last 6 years and most of the results are correct, stray ones appear you just roll over. Worth looking at in my opinion.

http://munzeo.com/mesembria-diobol/sort-0

This type of coin is a favourite of mine as you can probably tell from my avatar.

I find a way to get a good idea of the price of a coin is to search for it on v-coins and then order them into cheapest first. Keep looking through until you get to coins that you believe to be similar quality. Obviously with ancients there are many things to consider like the detail, strike, surface, how central on the flan, how big the flan and eye appeal etc.