James Plowright was an ironmonger and manufacturer of bicycles and tricycles. In 1876 he introduced his first bicycle and it was very modern for those days. The factory was located in Kings Lynn, Norfolk.
Plowright was one of the first to use an elliptical hollow backbone. The very special feature of this bike are the roller bearings, which were regarded very modern and absolutely dust-proof. Look at the big oilers on the front bearings!
This beautiful machine can be seen in the Velorama museum in Nijmegen, Netherlands. Serial number is 2941, this model was built until 1882. Since it has a front wheel spoon brake, I guess this bike was built around 1880-1882.
(this information was found in the Encyclopaedia of Cycle manufacturers, Ray Davies/V-CC)