Please Name this Emperor

That's the first time I encounter this handsome face of a Roman Emperor, despite the fact that I've collected hundreds of them so far. Could you please assist me to guess the name? The coin is tiny but thick and weighs 2.41 g. Thank you..

 

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Valentinian or theodosius II ? I need to look a little more......

 

I would name him Bob.

 

I suspect it is VALENTINIAN I

http://cngcoins.com/Coin.aspx?CoinID=46878

Thought Maybe Valens but, the first letter in the obverse inscription looks to be an " A " just above the forehead and all the issues of Valens seem to have a " S "

http://cngcoins.com/Coin.aspx?CoinID=125473

 

The reverse Victory seems compact & chunky in style like issues of Valentinian II

http://cngcoins.com/Coin.aspx?CoinID=44873

But the obverse Head type looks more Valentinian I ?

Maybe a Mule considering the amount of shift on the strike * note the huge margin on the Reverse *

 

Thanks for your sincere assistance. I'll try to post coins of better and clear lettering next time, wherever I can.