Hi Ken,
The bike looks to be a Levis "Pop" (short for Popular) which was a 211 cc two-stroke direct-belt-drive model built over a surprising wide date range. The EIC magneto on this one suggests it was built well into the war years (say 1916) or post war (1919 - pehaps 1922). A Levis expert will be able to help with details. Certainly in the "cheap and cheerful" category, but bikes like this were probably used by a wide cross-section of the community - you could certainly be very middle class and still choose an economical, lightwieght bike for transport.
Leon