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The "maple leaf" is probably the German Imperial Eagle used in many of their proof marks.
(Eagle) is the provisional proof of individual barrels or guns rough fitted.
(Eagle) (Crown) U is definitive proof test of the finished gun.
(Circle) 16 is for 16 gauge. It is probably the 65mm - 2 9/16" chamber instead of the current 70mm - 2 3/4", which would have been so marked. General opinion is the short chamber guns should not be shot with long shells.
Proper shells can be had, although probably rather expensive.
(Crown) W means that barrel is choked, probably full choke.
Nitro means tested for smokeless powder.
These marks are from the system in use from 1891 til 1939. The gun is probably a world war bringback, confiscated from some German hunter's house.
35 D I don't know, not in my list of German proof marks. A company mark or a local inspector's mark maybe.
8,9 is the BORE diameter of the rifle barrel. Add typical groove depth and it is probably a 9.3 caliber, of which there are several different ones.
As SDC said, it will take a chamber cast to tell for sure. You can get 9.3x74R and maybe 9.3x72R. Others would be harder, either formed and handloaded or a major custom effort, assuming you want to shoot the gun and not just show it.
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