To my knowledge only 12 cars actually left the factory in 1968.. R7012 being the last for car 1968, I have one of the 12 cars.
R7662 would not be a 68 car but a 1973 car.
I think the only registered 1968 cars in the UK at the present time are chassis numbers
R7001, R7003, R7006, R7010, and R7011 anyone know of any others?
You could check this register for some more, which is where 1972 is stated for the OP.
http://www.morganville.org/home
