36 years old.
1967
1977
No serial number provided
A Browning Auto 5 Lightweight shotgun was made in 1957 with that serial number on it.
It was made in 1965
No such model number ever used by Browning.
You must call Browning with the serial number to find out.
This gun was made in 1960
1966
Impossible to answer without a serial number and detailed description.
Receiver
The letters MW in the serial number of your browning stand for the year of manufacture which was 2004.