I bought this 2 days before. It is like a military instrument. I had a periscope some time before that was the same more or less.
I'd say it is a military item, some sort of observers optical sights. Possibly for directing artillery.
Are those leveling bubble windows above the numbered dial? As a former 81mm mortar operator in the early 90s, looks like some type of mortar site.
This one has no bubble level but the other piece I had it had. You can see some photos underneath. The periscope was awesome and also had numbers inside as well.
Well, if we're doing optical equipment .... I've just sat down to design a display stand for this (though, truthfully, I've just spent half an hour holding it against my face and turning all the knobs):
This is just ducking in for a quick look at a little tackle shop. Heaven help when I get a few hours at some of the bigger ones on the weekend
If Omega made ............ Saw this shaving bowl and had to have it, just to keep things in the family so to speak!
I went on a spending spree yesterday, to the point that I forgot to pick up the Cyma that I bought! You're going to have to wait for that one but I think it completes my Cyma tank collection with what will be an example from 1935, 1936 and 1937 in rolled gold, steel and 9ct (I do love those deco tanks). Anyway, this is my favourite pick up from yesterday: It might be a little grusome to some but she's a Victorian death mask from what looks like a very pretty girl in her early teens. I've not had a good look for a signature or any details ... I hope she has a name.
Reminiscent of the Russian PSO-1 Scope for their Dragunov sniper rifle: The 1.7 is a rangefinder combined with the 2-10 numbers above it. A 1.7m tall soldier will, at 200m, have their head right under the number 2 and their feet touching the 1.7 line, and so on all the way to 1000m (no.10.) The top Chevron in the middle would be the main aiming mark (or the crosshair in a normal scope) and the two scales either side are for windage/movement/horizontal measurement etc. I would say yours is a gun sight for a tank cannon. With that assumption, the very top mark of your scope would be for firing at point blank to close range (0-100m) followed by 200m, 400m all the way to 1400m and beyond. The chevrons to the left and right would be for measuring the width of the target as well as calculating for lead.