Motorcycle museum record
The Model 18 was Norton’s first overhead-valve production motorcycle and became a durable sporting single across the inter-war and post-war eras.
Museum plaque
A key step from early side-valve motorcycles toward Norton’s sporting single-cylinder reputation.
The Model 18 was Norton’s first overhead-valve production motorcycle and became a durable sporting single across the inter-war and post-war eras.
Why it matters. A key step from early side-valve motorcycles toward Norton’s sporting single-cylinder reputation.
Technical identity
This first expansion records museum-level specifications rather than pretending every year and market used one immutable specification.
Research starting point
Model-year specifications can vary. The museum keeps the stable historical interpretation here and leaves room to add exact variants, racing derivatives, engine codes and source-specific specifications later.