Hi Lubi. Martini - Long Lee - Ross - all took the same width of leather sling with stitched keepers and leather thong secure. The SMLE rifle
usually sported a web sling of a slightly narrow width as previous and most often the brass end secures were manufacturer marked and dated.
However many British and Territorial units were outfitted in leather equipments which required matching leather slings of the same pattern as previous but were narrow (same width as web) and usually riveted as opposed to stitched. In Canada white buff Snider slings were passed down to the Martini and sometimes to the Long Lees. P-14s are usually seen in service with leather SMLE slings. i have a British web sling in my collection with the brass dated 1904. Some Ross slings manufactured in 1916 are often dated with manufacturer stamp. JOHN