Dear David, Sounds like from the wrap-over you are describing that it's an early Pro Model dating from the 60's to about 1972. Carlton also made a Clubman with Nervex Pro lugs well into the 70's. The easiest way to tell the difference is the Pro is Reynolds 531 Butted tubing and the Clubman with Nervex Pro lugs is plain 531 tubing, only used in the main triangle. Measure the seat tube or stick your finger down to see if it is butted. My guess would be a Clubman. Kindest regards Frank
Frank Cohen Hoxton UK