Thanks guys,
It's definitely a Winchester Model 11.
When I first saw it, it looked like the most dangerous and dumbest design ever.
It is.
More than a couple of people were injured. Winchester ended up replacing a lot of those guns with the Model 12.
~~~
History?
At that time in history firearm designers would sell their ideas to the factory. John Browning was a prolific designer of guns for Winchester. Now, this is the early early early days of autoloading shotguns. JB has just designed and patented the Auto-5 shotgun and took it to Winchester to sell to them. Buuut...this time he wanted royalties, not a one time check. Well, this was unheard of in the industry and Winchester said no to John Browning. Oops.
John Browning knew this gun was going to be a hot seller and he really wanted those royalties. So he heads to Belgium and presents the Auto-5 to Fabrique Nationale, who said yes.
The gun was a great success, Remington and Savage both built the gun for the U.S. market under license, Winchester was left out in the cold with pump guns while the autoloader was selling hotcakes.
Winchester not wanting to lose out tried to reverse engineer JB's design. The patents were so extensive on the Auto-5 that replicating an operating handle was a patent infringement.
Thus the knurled barrels, injured people, the parting of ways between Winchester and John Browning, and many many decades of Browning's relationship with FN.