Royal Enfield Interceptor Royal Enfield Interceptor MK1 YB15656 September 14, 2020 James 0 Comment Royal Enfield Mark 1 YB15656 in Suffolk,United States Engine Number YB15656 Frame Number 12030 Gearbox Number Bike Details One owner, recently passed down through the family. Frame chromed. Needed restoration. Located in Suffolk,United States