Not a Winchester but any help appreciated |General Discussions & Questions|Forum|Winchester Collector

well as the title suggests, it’s not a Winchester. My nieces husband found this in the woods behind his old house about 8 years ago. I have no clue as to what it is but thought some of you might. He found it as is leaning against a tree. By my finger check it appears to be a 12 gauge, but I can’t say for certain- i thinks it’s really cool and so is the story, just wondering if there are any tell tale signs as to any information anyone might have 

thanks in advance