https://www.ngccoin.com/price-guide/world/sierra-leone-dollar-km-6-1791-cuid-1113483-duid-1535112 https://www.ebay.com/sch/i.html?_nkw=leone 1791
Don't know much about them but if you look at the coin on ngc site on the lower right line between lion and Africa there are 3 small rings?
I'd never seen this issue in my life, so I don't know what legit worn examples look like. Those disappearing denticles on the reverse right look exactly what I've come to expect from low-end reproductions, but I think some legitimate US early issues also show the same kind of weakness.