1960 Royal Enfield 693cc Constellation
Registration no. XRD 434
Engine no. 6770
Like BSA and Triumph before it, Royal Enfield went on to enlarge its 500cc twin, eclipsing its rivals with the 700cc Meteor, Britain's largest vertical twin at the time of its introduction for 1953. The crankcase remained fundamentally unchanged but the bore/stroke dimensions and engine top-end were those of the 350 Bullet, doubled up and restyled. Extensive revisions to the engine and the adoption of a new frame (shared by the Bullet singles) ushered in the Super Meteor in the autumn of 1955. While the Super Meteor was a fine performer, Enfield's next development - the Constellation - was outstanding. Based on its immediate predecessor, the new sportster featured a 51bhp engine, revised frame and a handsome 4.25-gallon fuel tank. On test with Motor Cycling magazine in Belgium, a Constellation recorded a top speed of 115mph while averaging 51mpg, impressive figures by any standard.
This example of one of Britain's rarer parallel twins is offered with DVLA correspondence stating that it is not recorded on the Swansea computer. However, the accompanying old tax disc (1976) and expired MoT (1979) should assist with recovery of the original registration mark (if still available).