I've got a Claud Butler Avant Coureur Special. The frame number is 5110 4843.
It is dark blue. By the time I started using it in the late '70s/ early '80s it had a B17N, Stratolite handbars, Dunlop wheels, Cyclo 4 speed gears and a Gnutti chain set and GB side pull brakes.
Most of the moving parts were quite worn and only the B17N, headset and Stratolites are still in place.
I'd be really interested if anyone could tell me more about this machine. I used it when I was going to school, Glasgow Uni and King's College, London. It's been resting since '93.