The Enfield Mk. 2 was the second version that was approved as “CARTRIDGE SA BALL PISTOL REVOLVER ENFIELD BL MARK II” in November 1880. It followed from the Mark I that was deemed unsatisfactory. The Mark I was only made in limited quantities for service in India. The case length was the same as for the Mark 2, but no specimens are known to exist of the Mark I. Initial loadings of the Mark 2 did not have any neck crimps, these being added after June 1881. (Erlmeier, Brandt Ref. 458).