Scott frequently proofed their higher grade guns in London to give them the cachet of a 'London' proof and possibly to help them sell a little better out of their London showroom,however out of six Premiers I have owned,only two have had London proofs,the rest being B'ham proofs ,including an Imperial that I still have,made in 1892.The sidelock 16 ga.in this discussion loks to have the same sidelocks as the model 180 ,also,but of course,much superior engraving. Marcus