This usually means it was sold for export in the early 20th century. Once cordite became widespread everything got those proofs.My Webley WG has BNP stamps on barrel, chamber and frame and 6 tons on barbell. BNP Means Birmingham Nitro proof. Could this indicate it is tested and approved for smokeless powder.
Can a Webley WG (1893) safely shoot Fiocchi 455 MKII ammo, assuming the revolver is in excellent condition.
Fiocchi says no