1914 ABC

I don't recall where I found this image (labeled "1914 ABC"), but in trying to find out more, I found that googling mostly produces images of the transverse mounted engine ABC, not the fore-aft arrangement shown here. The Douglas of the time had a similar layout. 
I eventually found the comprehensive ABCRoadmotorcycles site which provided the images below of the other side of possibly the same model (without sidecar) and also a P.V., once again similar but having a different intake manifold. The site covers the aviation, motorcycle and automobile history of the company.

P.V. Motorcycles