Help required, just in the process of restoring a Royal Enfield 350. When bought many moons ago was under the impression it was a 1938 model G but has always been army green. Can anyone shed some light on this bike . On the frame it is stamped 1891 and it's the same number on the left casting just by the cylinder. On the front of the casting by the oil filler it is stamped G2190. I believe the bike is totally mixed up with bits the old boy had in his shed. I would appreciate any help, preferably with photos, thanks in advance