Lovely rectangular crossbolt and something interesting in the crossbolt well; maybe just a tool mark? I'd say a tradegun as the water table wears no serial number. I guess a maker made a brace, sold one to a firearms merchant in Berlin and peddled one out the back door to a customer. A serial number of sorts toward the forend hanger and some Krupp steel variant recipe. Possibly a few touchmarks there but the dim lighting limits the view. Standing breech may wear a touchmark. Made in Suhl between 1912 & 1923 with a higher probability closer to the end of the range.

Kind Regards,

Raimey
rse