Hi Calgary. That is definately the sold out of service mark. Lovely that it is on a C96 Mauser. The C96 Mauser was a favourite among some officers in British and Canadian service. They supplied their own equipments for the most part and if they bought a pistol that was non-conforming to British service pattern then that was fine with the officer corps. An officer was allowed a personal weapon. This C96 was
probably commercially acquired and brought into WW1 era service. If the officer gets KIA or wounded then the pistol would remain Brit property and not a War Trophy. Not a Canadian item as there is no C encircling the sale mark. Interesting that the C96 was a preferred item
in the Boer War and WW1 which is telling about opinions of other pistols available at the time. JOHN