Hi Matt, yes the dovetails throw me out as well, judging by all the adjusting screws l think that it was a atempt by someone maybe useing a original Richards trigger block, being that it as what l think is a se/no stamped on it, to make an improved trigger for what ever reason. strange that the counter sinking to the screws is done tapered unlike other guns. hopefully someone on here bought it and can update us with some more info. l also don't think it was made by Westley Richards.
ATB
Mick