This will bring about $3000 max. Its an international skeet gun with Tula chokes they are not popular or sought as the barrels should be 27 1/2 inches long or there abouts. If perchance they measure 29 to 30 then you have a rare gun and should sell for more. Another factor is if its a top or side pin top lever release the side pin will bring more. Frankly at the prices these models bring it would make a great field because they do pattern well as a rule.The spring and pin kit is not from this era gun. You may find that if the trigger matches the serial number of the gun it will have a smaller guard than the extra one. If the second trigger came with the gun it should have a matching serial number or not a serial number at all.
Sum total of my knowledge but then free opions are worth what you paid for.
Best of luck with your search for input.
John Mc
