Dear Charlie, The model featured in the Viking catalogue is the "Trackmaster" looks very similar to your bike. To me looks like same fork crown and seat stay wrap-over the head lugs look much the same. The 50's framesets were called the Viking Master Series SS. Severn Valley, SS and SS/T. Complete racing cycles Severn Valley Road, Racemaster Road with SS frameset, Trackmaster with SS/T frame and Clubmaster. Great thing about the catalogue is the list of Viking victories since 1948 and the caricatures of the various team members. Point of interest Hetchin's made a Super Special at the same time, this too got abbreviated to SS just like the Vikings which were winning all the road and track events at that period. Alf and Hyman Hetchin had a fit with the Viking and Nazi SS link hence the Super Special got immediately changed to the " Nulli Secundus". Kindest regards Frank
Frank Cohen Hoxton UK