I just picked up a TS/24 with engine number (66nnn) and frame number (68nnn) which should put it squarely in the middle of production for 1924. The bike was recently registered (by the previous owner) as a 1924, sold to me as a 1924, and I believe it to be a TS/24
There is a neat stamping on the timing cover "Douglas 1925" (two lines). Should this be any cause for concern or can I just write it off as the timing cover having been replaced sometime in its history?
Are there any characteristics to distinguish a TS/24 from a TS/25? To my untrained eye, all TS's look the same.