Republican denarius but I’m unsure of the type.
The basic type is a denarius with helmeted Roma to right at obverse, and the Dioscuri galloping right and ROMA below at reverse.
Some types have a lettering between the horses and ROMA, but none of them appear to match with the lettering in yours.
Check them here: https://en.numista.com/catalogue/index.php?e=roman_republic_ancient&r=dioscuri+galloping&st=147&cat=y&im1=&im2=&ru=&ie=&ca=3&no=&v=1&a=&dg=&i=&b=&m=1&f=&t=&t2=&w=&mt=&u=&g=
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