Saw this at the Goodwill auction site. They have it listed as a "Canon Rangefinder Accessory" or something like that. Thought someone here might be interested in it:
Looks like a clumsy adaptation of a flash bracket to fit a Canon rangefinder with an offset tripod mount. Possibly for a Canon P or something ilke that?
It looks like it would probably fit my P... but I can't think of a really good use for it!
Probably the camera holder for an early Canonflex SLR, many had an R in the model name. Probably a variant for a long telephoto lens. Doesn't go all the way across the bottom because those cameras continued Canon's odd obsession with bottom-wind cameras.