The reverse is probably PAX AVG:

That's what I used to narrow down the search in the coins of Tetricus. That resulted in 4 coins: https://en.numista.com/catalogue/index.php?r=&st=1-2-79-80&cat=y&im1=&im2=&ru=1446&ie=&ca=3&no=&v=&a=&dg=&i=*pax+avg*&b=&m=&f=&t=&t2=&w=&mt=&u=&g=&c=&wi=&sw=
Those are similar, but only one have the same obverse lettering than yours, the one that I've linked. The reverse image on that page is quite poor, but something is visible at the leg of the figure.
There are some other examples on numismatics.org, although none of them great: https://numismatics.org/ocre/id/ric.5.tet_i.101
Yes, the AVG is in a slightly different position, but this is not the highest quality of roman coinage. If you check the examples that I've linked, one of them even misspelled it (VAG instead of AVG) and another one left almost an extra letter worth of space between the P and A.