[1] After having been turned over to weapons production for World War I, BSA returned to producing motorcycles again which were sold as affordable with reasonable performance for the average user.

The BSA Model E was the first of a series of successful V-twins[1] based around the reliable 770cc side valve engine with cylinders at an angle of 50 degrees.

There was an increased demand for affordable transport after the end of the war and the Model E became popular with BSA's matching green and cream painted sidecar option.

[3] Between 1920 and 1925 BSA produced a 100 small three-wheeled taxi cabs using the Model E 770cc V twin engine.

[4] A 1919 BSA Model E complete with matching sidecar featured in a car chase in the 1965 movie Those Magnificent Men in Their Flying Machines, where it was ridden by lead actor Stuart Whitman who played American cowboy Orvil Newton.