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Definitely "in Wien" = Vienna, Austria.
Typical Continental sporting rifle with single set trigger on one barrel at least, and folding peep sight for those long shots at chamois.
Hard to imagine an European rifle without proof marks. Herr Maschee might have been the maker or just the seller, lots of guns those days made for dealers with the store's name, not the builder's.
It might well be .500 BPE, CotW does not show any metric sporting cartridges in that caliber range.
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