Ross Mk. III s/n 154 / 1915 The two following letters are indistinct, the first one might be a "C".
Ex-CEF presumably. Stamped "1 BN" (?) over a number "10?1" (cancelled) and "2CAN" over 496. Stamped CEF / 15 inside a circle, but I have been advised by John Taylor that oddly, this is an inspection mark, not a battalion identification. The sling which I added, is an excellent condition original 1916 dated Canadian sling, made by "B.F. ACKERMAN ... PETERBORO ONT." The maker's name is in a horseshoe and there is a profile of a horse's head with bridle fitted inside the horseshoe.
Then this rifle went to the Royal Navy/Royal Marines and was issued to the British super-dreadnought battleship "H.M.S. CANADA". Stamped at wrist "M / 135" (RN and/or RM number?). Smaller miscellaneous numbers also stamped into the butt. This battleship was involved in the Battle of Jutland May 31 to June 1, 1916, the largest naval battle of the First World War, involving 250 ships and around 100,000 men. Sadly, we do not know WHEN this and other Ross rifles were brought on board that ship.
This rifle was in Chilean naval service when the ship, which was being built for Chile in 1913 but which the British took over for the war, was sold back to Chile and was renamed "Almirante Latorre". The British modified the bayonet belt hanging system, fitting an obsolete British bayonet scabbard mouthpiece and stained the scabbards black.
Rifle and bayonet matching with Chilean numbers "D.A. 90". It seems that a lot of owners and auction houses do not notice or pay attention to the third serial number placement, on the top of the bolt, by the safety. It is not visible unless one pulls the bolt back a bit. They simply list these as rifle and bayonet matching serial numbers, and never mention the bolt s/n as happened to me when I bought this rifle. Normally Ross bolts were not numbered as far as I know, but the Chileans numbered them. This bolt is D.A. 113 and I have a spare H.M.S. CANADA bolt D.A. 134. I found the matching rifle for one of those bolts, but sadly the owner was not interested in reuniting them. I am however very interested in reuniting bolt D.A. 90 with this rifle.

interested in reuniting bolt D.A. 90 with this rifle!