Brand: Royal Enfield
Model: Indian Chief
Years: 1958–1961
Engine: 700 cc twin
Notes: Longest wheelbase of any post-war Royal Enfield; single Monobloc carburetor; distributor ignition; 16" wheels; Albion heavy-duty gearbox with AM prefix. Earlier bikes had Super Meteor spec Engine, but later bikes came with Constellation spec engine. This is the only bike that was not replaced with an AMC model when AMC took over Indian in 1960.
Source: Wikipedia