Very nice, almost certainly a percussion conversion, possibly a pinfire in between??

As Mike says, early, made in the Birmingham trade, the multiplicity of sights classic for the South African market

Finger rest is early as is the peg fore end, but rebounding locks later?

They were made from early to quite late, I have one in percussion - Evans in 488"- 40 bore 2 groove and 12bore
and one Westley Richards built in 1903 in .577/450 and 12 bore, each with the 8 sights

A good pick up, especially of the price was good - enjoy shooting it!

TH