Circa 1951 Viking Severn Valley – SN 189
This frame is an early Severn Valley with Nervex Professional lugs. This variant never seems to have made it into a catalogue and so it was originally assumed to be an early Tour of Britain frame without some of the fancy bits – reinforced brake bridge and pump pegs that are a feature of Tour of Britain frames.
A study of available photographs shows that Ian Steel likely rode a frame of this specification in the 1951 Tour of Britain.