Help with Probus

Yesterday I went to a small coin show. As usual there was no ancients to be had, save one. I bought this coin for a modest $20. There was no attribution with the coin, which weighs 5 grams. Looking through Wildwinds, I can't find an exact match. So that's Jupiter with a globe, yes? And an Eagle on the scepter, what's that crescent between them? Are these all just variations? My pics are tough, but the surfaces are nice and smooth, mostly covered in silvering.

 

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Looks like RIC 840, Serdica mint...CLEMENTIA TEMP on the reverse...

 

Thanks. What about the crescent? Is that a variation from the star??

 

Now it looks like RIC 645, that has the crescent, but no eagle on the Emperor's scepter. I'm a little lost in my lack of experience.

 

RIC 840 has the bust head-Left.

 

This is Tripolis mint with the very distinctive style of that mint.

RIC 928 Bust Type C.

Mine:-

 

Are you sure? I see RIC 928 saying Jupiter is standing left with scepter topped by eagle. I see RIC 927 with Emperor standing right with eagle scepter.

 

The difference between RIC 927 and 928 is the obverse legend. 927 has P F.