Note the cool wheel with wings on it...
Made in CANADA!
I have a Tavannes trench watch, circa 1916 that has that same logo on the inside caseback, which is hinged on this watch. The piece was said to be made for the Canadian market in WW1. The logo is either the same or very similar to the Rotary watch brand from the UK. My watch's caseback is signed AWC Co , Sterling. I'll post a picture shortly.
Since Tavannes is a brand of Cyma Watch Co of Switzerland, and Cyma and Tavannes pieces are frequently in UK trench watch offerings, I had heard that AWC Co for the Canadian market meant American Watch Case Co., and was a subsidiary of or a joint venture with Rotary. The movement is signed and a 1904 US Patent number is engraved on the top plate.
Does this ring a bell with anybody?