-SG- 1931 Model 20s are few and far between and this one was probably produced late in 1930. Ian is selling it for £12000 or near offer and his sales blurb is below!!
"Rare Model 20 Norton (twinport) 500cc owned for 12 years, brand new exhausts. Petrol + oil tanks professionally painted, gate change on tank, chrome in overall good condition. New parts not fitted as undecided to make concours or just leave as a nice usable bike. Engine number 51766 frame 43436 + large history file. UK phone 01884 860600 or email@example.com"