Interesting...where is the bayonet lug? Has it been removed?

Who is the maker: LSA, BSA Co, BSA&M Co?
Is it marked "Lee Speed Patents" or "For Cordite Only"?
Does it have any of the following marks: crown over V, crown over NP, crown over BV, crown over BM?
What is the barrel length and overall length?

I can compare it to other trade patterns I have catalogued.

Thanks!