I say priceless because it once belonged to my great grandpa. he bought it new years ago. I would like to know what year and maybe some of you guys might know how I could find out just how old it is.

it is a Sears, Roebuck and Co. side by side 20ga.
it is a Laurona-Eibar (Espana) made in spain.
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he gave it to me about 25 years ago a year or two before he died. he took great care of it and I have as well. it is a sharp looking gun with lots of engraving on it. how can I tell how old it is?