Heres a weird id problem- a BSA single shot bolt action .22o Long Rifle with a 9 inch barrel , threaded to take the original 13 inch large diameter barrel extension. Both the end of the barrel itself and the barrel extension are knurled for hand tightening , the extension has a blade foresight fitted.

The receiver is marked with a registered number - 533202 - and a patent number - 10941-07 ( may not be correct as is partially obliterated ).

Any BSA afficianados out there have any information on age or even model name?