I've had this bike for around 10years. A guy at an old bike shop told me a few things about it: that it was probably made in the 1930s-possibly assembled post-war, and that it isn't a particularly notable frame but (what he called) 'the kit' is in unusually good condition. It is an amazing ride-VERY heavy-very fast-and the monster drum brakes stop it quickly. I took the rear wheel off to change the tyre a couple of days ago and things escalated into a wheel/hub strip down-it was all so dirty that it was impossible to see the individual components. Here are some pics.
The deralier is fixed to the frame-the bracket with the arc shaped end-sits between the cogs and slides the cassette on splines on the hub.
The rear wheel felt a bit rough-a ball bearing has split and the bearing race (is that the word?) is heavily worn. The other one is not so worn.
Last two are part of the rear brake mechanism-
I'm going to take a few more pics as i put it back together and will put them up over the following days. Any comments or info on this old bike would be much apprieciated-
thanks for your reply, Sam-you were right, with some cleaning the word 'Trivelox' is visible on some of the gear components-they work as you described. This is what i've found so far on Trivelox gears:they were manufactured in Birmingham, England and appeared on many makes of more upmarket British roadbikes, particularly tandems, in the 1930's. Apparently their was a British thing about keeping the line of the chain fixed and Trivelox, and Sturmey Archer, fall into this engineering tradition.
heres a pic of another Trivelox set up on a 1938 BSA tandem that i'm considering buying
your bike looks amazing BTW-i'm marvelling at how much work it must have taken to get it into that shape