Anything is possible. Try checking at browning.com
1926 IS THE YEAR THAT WINCHESTER WENT TO STANDARDIZED 2-3/4" LENGTHS ON THEIR 16 AND 20 GAUGE SHELLS.
yes.
No such weapon made by Browning.
Not if you want to continue living.
Made in 1978 First three numbers should be one of the following: 213=12 gauge 233=20 gauge 173=28 gauge 183=.410 bore
12-70 is frequently used to indicate the gauge of the shotgun followed by the length of the chamber in millimeters. In the US, or non-metric measurements, that means a 12 gauge shotgun chambered for 2.75 inch (usually read two and three quarter inch) shells. Sometimes, you'll see 12-76 to designate a 12 gauge shotgun chambered for 3 inch shells.
The 69 is the Police version of the 67 In like new condition they are worth about $200 down to about $50 in less condition
Maybe 300
According to Browning: "Silver 12 gauge, 3" chamber models will shoot all 1 oz. and heavier factory lead and steel 12 gauge 2¾" and 3" field loads. Silver 3½" chamber models will shoot all 11/8 oz. and heavier factory lead and steel 12 gauge 2¾", 3" and 3½" field loads." I would find it hard to believe that a 12 ga 3 in chamber shotgun could only handle 1 oz loads. Re-check your manual. Everything they have online reads 1 oz. and heavier.
Google a company called Polywad. I have bought shells from them and was satisfied with their product.
100- multiple thousands depending on specifics.
About $400.