I've discounted Sirmium and Siscia as the M in their mintmarks would be on the extreme right character wise.
'H', 'M' and 'N' can look very similar on these coins. I think you may have lost the first 'S' and what you thought was a 'H' is infact the 'M' of 'SM'.
This is about as far as I can go to be honest - maybe in hand you can cut it down further.
bobbyhelmet- Great! Thanks for all of the help. I greatly appreciate it! I think that the last two can be stricken from the list, and Thessalonica can be as well. So it is either Heraclea or Nicomedia.
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