We need more pictures of the rest of the gun. What is the serial number? If you are using the little Winchester book to check the date is not always accurate, especially with the WWII guns. If you look behind the action bar on the bottom of the barrel right in front of the receiver you may be able to see a 2-digit date. You'll need a light.
That bomb is way too early for a post WWII shotgun.
"There's a race of men that don't fit in,
A race that can't stay still;
So they break the hearts of kith and kin,
And they roam the world at will." - Robert Service