B vs C vs Girdraulics
It is self-evident that the evolution from Series B to Series C was a gradual process. Just consider the following early post-war changes by way of examples: the Rear Damper, the RFM length/curvy seat brackets/brake-cable pivot, the Crankcase changes, the Timing Cover, the K/S Cover, the Steering Head-Stock variants, Cyl Head Finning, Gear-Change Linkage, Cams, Cyl Studs, Large Idler, prop-stands, rear stand, petrol tank, 3.5" dynamo, stop-light switch, rear mudguard stays - to name but a few.
We know that all these modifications were incorporated at different times. I agree, that the arrival of the girdraulics was probably the defining moment that a decision was taken to announce the revamped machine a Series C, but some early Series C's still had Bramptons. That may have been because of a need to use-up existing stocks, or to meet specific customer requirements, or because of a shortage of girdraulic parts in the early stages - or more likely a combination of all three. I guess we'll never know for sure.
If I put Bramptons on my Series C, does it become a B? I say not - simply a C with Bramptons. All this is just my opinion of course, bu I have been known to be wrong, and lets face it, at the end of the day its all just academic. Go enjoy riding your Vincent whether it be A, B, C or D; the sun is shining and that's exactly what I'm about to do now.
Regards,
Peter Barker