I have had this sling for quite a while and have it on a M 1917. From reading an article in a back issue of the GCA Journal ( Summer 1990 - The Mysterious Enfield Sling by John H. Spangler), the sling seems to be the first type or pre 1917 sling. Article states that this model will have the metal fittings marked "NOBUCKL and PATD 7-21-14" as this sling is marked. Can someone confirm that this is a 1st type pre 1917 sling manufactured by the "Kerr Adjustable Strap Company, Inc. ??