Are Watson Bros a "top" London maker ? Personally I say no . Yes they made some nice guns but so did a lot of others and in its day this would have been a nice gun . But have a close look , the pins are a bit chewed up , the wood appears below the metal on the lock plates and there is no picture of the points and I would hazard a guess the checkering has been recut . Looking at the photo of the barrels from the muzzle I have issues with the ribs .Have close look at the photo of the barrels showing the name , is it just me or dose it look like blacked Damascus?
I think this is a gun that needs close scrutiny before any bidding .
I will leave questions to its true value to others .