Sjögren 1900 patent self-loading shotgun
Designed by Swedish inventor Carl Axel Theodor Sjögren, manufactured by
AB Svenska Vapen- och Ammunitionsfabriken, Stockholm Sweden, and Håndvåbenværkstederne Kjöbenhavn, Copenhagen Denmark c.~1909 - serial number 5396.
12 gauge 5-shot tubular magazine, recoil operated/inertia semi-automatic.
A sexy shotgun, the Sjorgen action became the basis for a lot of automatic shotgun design, for instance the ones subject to Benelli’s patent that recently expired. This action was adapted to a 7,62mm military rifle design and offered during various military trials, but apparently not accepted for unknown reasons.