Identifying old Douglas motorcycles Part 1: 1907-26 Models 2-3/4hp, 3-1/2, and 4hpOwners and folks finding an old Douglas motorcycle (or bits and pieces of one) often need to know how they may be able to identify the year and model. What follows is a personal attempt to provide a guide to the codes and numbers that the factory put on the main parts of Douglas machines -specifically, frames, engines and gearboxes. Supplemented with a description of salient features that in the addition/absence of the codes, might help also to identify a specific year, or indicate a mixture of parts.
Some (probably quite a few) of these early machines are, strictly speaking, hybrids - bikes that are made up of parts from around the same period and/or similar models, so the data on these can be a little deceptive. Douglas made basically the same machine, known as the 2-3/4hp, for a very, very long time with small incremental changes from year to year. They must have been one of the last firms still offering a belt drive machine in 1926!
The link below will take you to a page with additional information and tables to identify the various models and years. These pages will be updated from time to time as additional information comes to light. So note the version number near the top, and compare it to any copies you might have saved or printed. There are also hyperlinks back to this post, and to
Part 2 and
Part 3 covering the rest of the Douglas range.
The information in these tables has been collected from various sources: factory records, registers of extant machines, Douglas publications, articles in the London Douglas Motor Cycle Club magazine the New ConRod, and personal knowledge. While every effort has been made to provide the most accurate information available, the information provide above is offered as a guide only. It is not recognized as official dating data by any licensing authority. The numbers and codes shown in these files are what appear to me to be representative of most of the machines registered as that model. You may find them useful as indicators, but for final confirmation please do check with the experts in the London Douglas Motor Cycle Club (LDMCC), as I cannot accept any responsibility for any errors that may occur through the use of this information for identifying something that you find.
If you have any additional information, corrections, or constructive criticism, the author would be pleased to hear from you. Please address your comments by
e-mail or
Personal Message using the link appropriate to your choice in the left block beneath the avatar. Alternatively, to make public comment please use the Back button on your browser to return to the Topic Index and post a new topic by selecting the
Start New Topic link at the top of the page.
If you have questions about a particular part or bike you are trying to identify, please use the Back button on your browser to return to the Topic Index and post a new topic by selecting the
Start New Topic link at the top of the page.
-Doug K.
Copyright Doug Cross, Doug Kephart, April 2005
The Link:Part 1: 1907-26 Models 2-3/4hp, 3-1/2, and 4hp[Update text. 26Oct22, -Doug]
