That cocking arm made of a round piece of steel reminded me of one I have ...
It is my "KRIEGHOFF" air rifle!
That one is 108 cm long with a 50cm barrel.
Made in the early 1950's.
http://www.network54.com/Forum/68145...8757/Krieghoff
Show us a pic without the stock and see if the trigger unit is the same?
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Frank