Roman Coin?

Hi I have come across this very old coin, possibly Roman coin? Sorry not much detail on the photos, so this may be a challenge to work out!

 

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Yes it is a Late Roman Bronze coin.
With the SECVRITAS REPVBLICAE reverse and the shortish legend I can make out on the obverse, I'm going to guess that it is from the emperor Valens.

 

Valens. A.D. 364-378. D N VALEN-S P F AVG, diademed, draped and cuirassed bust of Valens right / SECVRITAS REIPVBLICAE, Victory advancing left, holding wreath and palm

I can't quite make out the mintmark, but your coin is either from Arles or Lyon and I am thinking Lyon, like below but I believe I can see a dot at the end of your mintmark

 

Thank you so much, oh wow that's amazing thank you so much. Do you know if it is worth anything?

 

Unfortunately, in that condition, it is basically a slug. I get ones like this in uncleaned lots I occasionally buy. Less than a dollar a piece. Still an interesting piece of history.