From the same 1913 catalog as some of the images in the Harry Bashall 1912 TT winner topic
here, some other 1912 Douglas racing machines-

J. Haslam riding in the Tourist Trophy race.

Rex Mundy during 1912 season. Venue not stated, but background similar to photo of S.L. Baliey captioned at the French GP. Note interesting chain drive to transmission
outboard of the flywheel.

T. Kickham, venue not stated.

Previously published picture of Willie Douglas. Not much to see of the machine, but good study of handlebar control layout, and racing togs of the period!
Sorry about the quality, but the originals are only about two inches wide.
-Doug