Good luck charm ID

This coin was made into a pendant long time ago, in my oppinion, maybe even back in Rome.
It was in a bag with other uncleaned coins I bought.
Can anyone please help me identify the coin
Thanks

 

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I think it might be Constantine II not sure of the mint though.
CONSTANTINVS IVN NOB C, laureate, cuirassed bust left, holding Victory on globe and mappa / VIRTVS-EXERCIT, standard inscribed VOT X in two lines standing on ground, two captives seated at its base. S-F across fields.

 

Thanks Ajax!
I think you are correct, but the letters across are S - H

 

Ohhh yeah... it looks like it's S-F over HL

 

After closer look , letters below F are I L

 

Wow, quick attribution there. I don't know how some of you guys do it.