ancient coin found in my coin lot

I have no idea what this coin is or where to start, any help appreciated since coins this old do not enter my sphere of interest at the moment.

I do not know also if real or reproduction

sorry about this

its 2.5 grams, looks bronze, its about 2cm/1.6 cm

thanks

I am no expert but perhaps this will lead you in the right direction. On the obverse I see  “Consta” to the left of the bust and “ntius _ _ _" to the right of the bust. Constanitus. So far I see nothing that matches the reverse. Good luck with it.

N#137659

https://en.numista.com/catalogue/index.php?r=&ct=coin&im1=6387cfeb0493c.jpg&im2=6387cff3ce515.jpg&tb=y&tc=y&tn=y&tp=y&tt=y&cat=y&ru=&ca=3&no=&v=&i=&b=&d=&u=&a=&dg=&m=&f=&t=&w=&mt=&g=&se=&c=&wi=&sw=&p=2

thanks for the help appreciated

Constantinus I follis.

Obverse CONSTANTINVS AVG, reverse VIRTVS AVGG.

Closest one is RIC VII 184, searched on Wildwinds (https://www.wildwinds.com/coins/ric/constantine/t.html) and didn't found a perfect match for you, your variant isn't there. And that type (helmeted Constantine with that VIRTVS AVGG on reverse) is not here yet.

thanks for help will try and get more info and post it here