Help me identify this coin

Picked this up for a buck.
Did I do ok? And should I soak this in olive oil?
Any info appreciated.

 

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Appears from the reverse to be a SOLI INVICTO COMITI follis - These were issued for the houses of both Constantine and Licinius
If you could get a photo of the obverse with the legend fragment in-focus and no camera movement during the shutter, it might be possible to tell you who issued it.

 

Possibly arcadius or emperor around that time. Possibly Saturn but most likely Jupiter on reverse. Could. Be theodocius

 

It's Crispus, with a CLARITAS REIPVBLICAE reverse, like the coin below. In the condition your coin is in, it's certainly not worth more than a dollar. There is nothing you could soak it in that would help...not even holy water; as I can see from the picture that surface is actually flaking away.

 

I should have posted this example for comparison's sake:
http://www.stoa.org/gallery/album162/38_Constantine_I_Follis_310_13_SIC_TRE?full=1

I hadn't made the association that the CLARITAS REIPVBLICAE was so similar to the SOLI INVICTO

 

i wouldn't soak it, like Victor said, it's flaking away. i'd leave it like it is.

 

Thanks everyone!! It's a lot smaller than than the coin with the link. It's only 2.2 grams. Do you know the years these were minted?

 

It was struck A.D. 317- 318 from Trier, Germany. Weights vary a lot on LRB's, the average for these is circa 4 grams. Yours is also worn and has a piece missing.

 

Since it's Crispus, it can be no later than 326. Without digging around in some books, it's hard to be more precise than that - particularly since we can't read the (exergual) mint mark on your piece (although the "F - T" in the fields makes it look like a Western mint) and the minting years for a type might vary a little from mint to mint.

Okay, I had to check - with F - T in the field it's from the mint of Trier and dates to 317/18; Cf. RIC VII p. 177, 175-8 & 182
That would put it right at the end of the era of the follis. In 318 Constantine introduced a new silvered billon coin, similar in size to the follis, but a bit more substantial. Also the new centenionales introduced in 318 tended to have civic or military reverses, shunning the former tradition of pagan deities, as behooved the first emperor to legalize Christianity.

 

I thought that I had already posted that information.

 

Thanks guys! It's definitely worth a dollar to me.