Could be for export to fool someone somewhere who had only a little knowledge of English guns. I once had a rather nice boxlock non-ejector marked W.J.GREENEN, The Strand, London. Most of the Forgery type guns I have come across have either had addresses on just The Strand, London or Oxford Street, London but with no number or other details. Just never come across a Lankaster before. Reilly and Moore with various spelling differences crop up from time to time. Lagopus.....