Hmm… in searching the internet for Smith&Wesson WWI Canada revolver I found several sites selling one, or that has sold one. One mentions the Canadian registration markings. Another site mentions crossed flags. A mention of one being converted to take .45 acp at Canadian Armory, for half moon or full moon clips. 1906 patent date on barrel. Manufactured in 1915. Refers to it as Smith & Wesson 2 nd model hand ejector. It has already been sold.

Anyway if anyone stumbled on one of these at a gun show they are well marked.

One has battalion makings 1.C.P.M.G. which stands for first permanent machine gun battalion. Says they saw service at the battle of Somme. Which reminds me that some these pistols are possibly still in Europe.

No doubt this is only a surprise to me. Not a surprise to any serious military gun historian.