These were not high dollar guns, but fairly well made. Value is around $150-$175.
In the 60's
he is the singer for guns n roses
Inexpensive "working" gun.
WE is mostly metal guns. See related links for info.
SN's were not required until 1968
The best place to get more information about the age of guns is at a gun store or pawn shop. Many times pawn shops know about history of guns so that they can buy them.
Your question spans 100 years, and thousands of different guns. Good questions get good answers. We need info to get you info.
Sears didn't make guns - they sold guns marked "Sears" which were made for them by many different manufacturers. Most bolt action shotguns were made by Mossburg.
Is this gun marked Marlin MR-7? If so, Marlin Firearms Co. can give you info on these newer guns.
http://www.savetheguns.com/firearms_101.htm - As good as any place to start...
Actual guns did appear on the scene in about the 13th century, and about ten cannons were used in his army in about the 15th century. that's about a 200 hundred year difference. This means that they probably did have guns. In fact it's a very likely yes, but that the best info I have on that.