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If it is a double, remove barrel and you will see it along with serial #.
as your looking down the gun, the gauge should be stamped on the left barrel back by the stock.
Blue Book of Gun Values will help.
What is the value of a 12 gauge double barrel shotgun made in 1970?
By the specific serial number stamped into the frame.
THey were made by crescent firearm company.
I have a 16 gauge double barrel for sale.
Gun show, Shotgun News, gun shop, want ads.
Try gun shows, want ads, gun shops, google.
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Go to google and enter "20 gauge double barrel shotgun" then click the (images) button at the top of your screen. Then hit (search images).