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.
One option is to contact Browning and order a history letter. They are @ 40 USD.