The horizontal line under the "C" is unusual. Reminiscent of pre-war RASC "B" vehicle practice (but not motorcycle as they used the black background).

If those are sash windows in the background then presumably a U.K. photo ? Perhaps prior to joining the BEF in France.

Have seen that horizontal stripe before, but on what bike?

Very nice pictures, keep them coming please!

Cheers,

Lex

email (option): welbike@welbi**.net

Great picture indeed, thanks for sharing!