When I was 19 I had a Royal Enfield Constellation, 700cc twin. Awesome bike, Bonneville eater in its day. Only problem was I didn't have a full licence at the time so didn't ride it much. The very late Interceptor (I think it was designated Mk2) was truly awesome. Not many made before the factory closed in about 1970. Had an odd arrangement for the foot rests, which were welded to the exhaust pipes.(My dad worked for Royal Enfield for a little while. I had a poster of a RE Interceptor on my wall for ages.