Haven't seen that marking. Choke markings on Browning shotguns are coded by a series of asterisks and dashes. They also had a marking called 'ACIER SPECIAL' which simply means special steel, indicating the gun was suitable for smokeless powder.
NO! The 1187 barrel was for remington shotguns,the auto-5 shotgun is a browning shotgun.
It shouldn't say light twelve on the barrel, but on the receiver. Light twelve means that the gun is a light weight version of the standard Auto5 shotgun.
it was made in 1967
You need the services of a gunsmith
Go to Browning.com and you can download a manual
Please identify the model. Looks like it could be an Auto5 made in 1948.
87 years old.If you have a 12 gauge shotgun then it was made in 1906,if your shotgun is a 16 gauge,then it was made in the year 1919.
Try e-gunparts.com, Mid West Gun Works, Browning.
1973
See what they are selling for at Gunsamerica. http://www.gunsamerica.com/ That should give you a pretty good idea.
Providing it is a Auto5 which wasnt noted, it would have been made in 1929
If your browning auto-5 is in excellent condition(85-90%)original finish?I would assign a value of 550-650 dollars.