The Browning website has a page enabling you to find your shotgun's age, but you have to know the type of shotgun you own. Go to the page, then click on the type of shotgun it is - there are 15 types - and then reading the page for that gun's serial numbers. Look for the series of serial numbers that includes the one you are interested in: #48162.
2003
1977
1990.
1991
1993
You will have to call Browning or provide the serial number.
12 gauge Belgian Browning shotgun, serial #296305
With the serial number that you provided,your Browning superposed shotgun was made in Belguim for Browning in the year 1955.
You will need to call Browning.
This Browning shotgun you describe was made in 1959.
You will need to call Browning.
Call Browning with the serial number.