Unfortunatly I have misplaced my list of British proof marks so I can not give a definative answers so am relying on memory .What does concern me is that there are no proof marks on the action .If the gun was sold as a barreld action it have them .If the gun had later been submitted to London proof it would have been marked as "Not English Make " therefore I have doubts as to the authenticity of the marks on the barrels .Fake British proof marks on non British gund are not uncommon .
21 is the bore size the barrels were proofed at , this equates to .605".
