It should be marked on left rear of barrel with 1 star is full, 2 stars is mod. and 3 stars and a bar is improved cyl
See link.
What gauge and grade is it?
A 12 gauge shotgun with changeable choke tubes that fires 3.5" shells.
They came in various barrel lengths and choke combinations. If it is not marked on the side of the barrel, you will have to pattern the shotgun to determine the choke
You will have to contact Browning to find out.
What is the value of a 12 gauge Browning shotgun serial J68824?
No way to answer without knowing barrel length and gauge.
A bolt action shotgun in 12 gauge.
Shotgun made by Browning.
There is a tool known as a choke gauge. It is a tapered length of metal that is placed in the bore, and measures the width of the muzzle. Or- shoot the shotgun, and determine how it patterns, Purpose of a choke is to to open or close a shot pattern- and proof is in what the gun does.
To determine the exact value of a Browning automatic 20 gauge shotgun made in Belgium, a couple factors would need to be taken into consideration. Some of these things are the age and condition of the shotgun.
Browning has information on their web site.