The original question referenced a ventilated rib on this shotgun. PLEASE, people, if you change these questions make sure you include ALL the information given - it makes a difference. You have a Browning Superposed made by FN in Belgium for sale by Browning. It was made in 1961, and should be the 'round knob/long-tang' configuration. That means the pistol grip is rounded on the bottom instead of squared, and the trigger guard extends down the front of the pistol grip. These are collectable shotguns, and being a 20ga makes it a bit more valuable than a standard 12ga. Possible value, depending on condition, originality and features can approach $2000-$2500 (assuming it is a standard grade and not Pigeon, Diana, etc). The big question is whether the gun has 'salt wood.' Browning used a salt process to dry stock blanks during this time period and sometimes the salt would not be removed completely, causing the guns to corrode badly underneath the woodline. If you have a 'salt gun', value is going to be reduced by at least half. If the gun is going to be marketed, we'd be interested. sales@countrygunsmith.net
You will need to conatact Browning and order a letter from them
Can you idenytify the model? Type of action etc...
Ned Schwing's book will have what you are looking for.
You can order a history letter from Browning for @$50.
100-10000 USD depending on EXACTLY what you have, condition, box, papers, history, accessories.
100 to multiple thousnands depending on exactly what you have and its condition, accessories, box, papers, history
This is the same as a Superposed model shotgun. Introduced in 1931, Browning still makes these in Belgium.
Browning offers history letters for @$40 USD
If you are talking about a Browning Hi Power, German designation P-35 with original grips, stamps and magazine in the condition NRA 90% or better and the slide stamped Fabrique National D'armes D'guerre Herstel Belgium (spelling may be wrong), $800.00 to $2500.00.
Only way to know is to call Browning and request a history letter.
Contact Browning and request a history letter.
For about 40 USD you can get a history letter from Browning on your firearm. The sn you list does not follow normal convention. Just the numbers would date it to @1926.