I can't speak directly to shotgun bits as my experience is more toward the single projectile arena, but I'll tell you what I *think* I know.
Husqvarna was known to start a model production by sourcing actions and complete firearms from another manufacturer. Early examples of 'their' 1894/96/98 Mausers (Husky Model 46, 46A, 146, etc.) can be found with German markings. The 1887 revolver was sourced for the first four years from Nagant in Belgium as a complete pistol. As time passed, they would bring a model 'in house', often under license; reference the Model 1907 pistol which is a near exact copy of the Browning 1903. Some models were built only in house such as the 1600-series rifles.
My expectation is the shotgun you mention was built in Sweden by Husky. I will full well admit that to be nothing more than a guess on my part and would willingly allow correction.
