Mid thirties Norton Model 18

A slightly blurry photo of a Norton Model 18 from, at a best guess, 1936 - though it could easily be a year either side.

1936 Norton Model 18.

errata: Thanks to John de Kruif of the excellent Vintage Norton site for pointing out that the cradle frame (the connecting pieces of frame under the engine) on this bike makes it an ES2 rather than the open loop framed Model 18 that I identified it as.