You must call Browning with the serial number to find out.
Go to Browning's site, Support, Date Your Shotgun.
It was made in 1981.
The MW in your serial number indicates that the browning shotgun in question was made in the year 2004.
Impossible to answer without knowing which model.
With the serial number that you provided,if you have a Browning model auto-5 shotgun?Then this shotgun was made by FN of belguim for Browning in 1939.
You will have to call Browning.
Your browning shotgun was made in 1990.