The pic looks like 2 different revolvers. Maybe police....because I think the colonial troops used larger caliber stuff...had to knock down those tribesmen all hopped up like our boys discovered in the Philippines..
The revolver underneath looks more like a British Bulldog variant.
European revolvers of the late 19th Century tended to look somewhat alike; the Nagant variations of Belgium, Sweden, Switzerland, & later the Russian gas-seal version. The French 1892, like the others, was in some 7.62mm caliber.
Then there’s the Austrian Rast-Gasser 8mm revolver. The Japanese Type 26 was a composite of the others.
All these were later swept aside by the 9mm parabellum self-loading pistols.