Early Douglas owners are lucky in that the year of manufacture was usually engraved on the chain cover . This example dates from 1924 , the last year of belt drive . The design was basically unchanged for ten years . The gearbox gives two speeds .
Discovering Old Motor Cycles By T. E. Crowley N° 160 in the Discovering series First published 1973 Shire Publications Ltd. 12B Temple Square - Aylesbury Bucks - UK
