This is 14mm coin and 4.01 gr in weight and I think it is from pre Roman Thessaloniki, but I am not sure and would like your help with explaining the coin . Thanks!
Mine is a little bigger than yours at 19.7mm and 7.1g On yours the reverse legend (up & down) is the name of the magistrate, mine for example is TIMA. While I've had mine for several months I haven't completely attributed mine and keeps getting put on the back burner. Try looking around Rogers, I believe thats were I left off at. I don't have all my information handy and am going off memory. Hope it helps some. Definately Thessalian League though