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No serial number = no way to answer.
The MW in your serial number indicates that the browning shotgun in question was made in the year 2004.
You must call Browning with the serial number to find out.
Impossible to answer without a serial number and detailed description.
The 2 letters in your serial number dates your shotgun to the year 2004.
No way of knowing without you providing the model number/name of the shotgun and the serial number that goes with it.
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.
Your serial number indicates that you have a Browning light weight model auto-5 shotgun that was made in the year 1964.
Your shotgun was made in 1947 with the serial number you provided.
The 4G prefix to your serial number indicates that your Browning auto-5 light weight shotgun was made in Belgium for Browning in the year 1964.
In order to date your Browning sweet sixteen model auto-5 shotgun,you must include the serial number in your question.