If you go to browning,s home page there is a way to age your shotgun there.
2003
1977
1990.
1993
1991
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.
2003
1988
You will need to call Browning.