Looks like you have a Canon viewfinder that fits in the fash shoe of a rangefinder camera. It appears to be ajustabke for different focal lengths and also for parallex. The first photo shows the different focal lengths that it can be set to and the second photo shows the parallex correction which can be set after focussing the lens and reading the distance off the lens. The distance shown on the lens is then set on the finder. I am sure some of the Canon users here will comment. It looks similar to a Leitz finder that I have.
It looks like a partial copy of the Leitz "Imarect" finder. If that's the case, it does not zoom like the cylindrical Tewe or Nikon finders. The focal length dial controls an internal rectangular mask that gets smaller as you change to longed focal lengths. OK for 35mm and 50mm, and rather tiny for 85/90 and up. Not great for many glasses wearers at 35mm.
Canon called these a "Universal" finder and has a small thread in the front nose to accept a 28mm chrome adapter similar to a Leica version ............which the name at the moment escapes me.
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