Uncertain Caesar on Gloria Exercitus AE-3 of Cyzicus

Need help with attribution. The coin is worn and the patina is thick, so the obverse legend isn't as clear as I would like. Who is this? Constantine II? Constantius II? Constans? Delmatius?

Reduced Centenionalis of Cyzicus Mint, AD 337-347
1.34 gm; 16.3 mm

Here is stuff I am POSITIVE ABOUT:
The obverse legend is unbroken and ends in NOB C
The reverse legend is GLOR· IA EXERC ITVS
The mint mark in the exergue is SMKB

I have it narrowed down to one of those listed in RIC vii, pp. 659-660, no. 136-146.

Thanks in advance!

 

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Another photo, taken in natural sunlight at a very oblique angle:

 

Maybe this one? Although I can't make out the mintmark on my coin. This is my first ancient coin I got this past summer. Never id'ed it...

 

The next step is to count bumps and see which ones remain possible. Lacking IVN before NOB C eliminates Constantine II etc. My best guess using this method is Constantius II.

 

Thanks. I think it's Constans:

 

The last symbol in your mintmark looks like an "S" but is actually ϛ (digamma); which is Greek for the sixth workshop. Everyone calls it an S, myself included, but the distinction helps ID your coin. Your coin must come from an Eastern mint and I think there were only about three that would have ended with this workshop. It looks an S before the workshop though, so CONSS, from Constantinople. The style also looks right for Constantinople, but in hand you should be able to make out the mintmark better than I can from a picture.