This is a modified B25S frame with oil in frame with an extra oil tank. It has a very early C15T engine that is in excellent condition with trials gearbox. It has four bolt oil in frame forks NJB shock absorbers and acron valanced rims. It is or was a competitive bike when I last used it some 16-17 years ago. It is reliable and trials ready. Having made that statement it would definitely benefit from new tyres to take advantage of its capabilities. The registration number is a non transferrable year related I also have another C15 and a Royal Enfield Bullet for you to look.