If it comes with the original box in good shape and all original paperwork, IMHO, it is not worth it. I wouldn't go more than 1200 out the door. If you want to buy it, walk in and lay down 10 Ben Franklins and see what happens. Having said that, it depends on how bad you want it, how bad someone wants to sell it, where you are, where it is, the phase of the moon, etc..
Depends on what the barrels are choked.
They tell you what the barrel(s) is/are choked. One-full, Two=Modified, Three = Cylinder.
both barrels are not choked
Well, other than being made in 1963 you dont tell us very much about the gun. Trap, Skeet, Broadway Trap? How long are the barrels? What grade? How are they choked? MOST importantly, what condition is the gun in? As an example, a 12ga Broadway Trap with 30" barrels choked F/IM, in about 80% condition, would sell for around $900. A Field Grade Superposed Lightning 12ga with 26" barrels choked IC/M, in mint condition, would sell for around $1500. A Diana Grade Lightning in mint condition might reach $5000 or more depending on other factors.... If you can send more information, and especially digital pictures, to sales@countrygunsmith.net we'll be able to help you out further.
A fraction of .001".
Cylinder Bore meaning the barrels are not choked (narrowed at the muzzle).
You will have to call Browning to find out.
Full choked barrels are not ideal for slugs, but if pressed we would use a sabot-loaded projectile.
No way to tell from the sn. You will have to contact Miroku
Other than it being a standardweight Browning A5 12ga made in 1961, you dont provide much information. 26" open-choked guns bring more than 30" full choke guns, and condition is everything. Average to you may be poor to me. Without detailed information on a potentially collectable firearm, the best we can do is offer a range of $250 - $1000. www.countrygunsmith.net
Made in 1937. Not many of these around, so you should get a professional appraisal. It should bring a premium price.
Some were, they had a folding rear sight and a ramp front sight on a 21" or 24" cylinder barrel. Other 67s had longer choked barrels