To many variations over the past 100 yrs to answer.
The barrel will be marked "Made in Belgium"
your browning auto-5 shotgun was made in 1947.
If you have a Browning auto-5 shotgun in 12 gauge then it was made in 1927.If you have one in 16 gauge then it was made in the year 1931.
It was made in 1930
your browning 16ga auto-5 shotgun was made in 1949.
50-550 uSD
This is a 16ga Auto 5 made in 1953.
Without a detailed description of all features and markings, you must call Browning.
Your browning auto-5 12ga lightweight shotgun was made by FN for browning in 1967.
With the serial number that you provided,your Browning auto-5 shotgun was made in the year 1946.
Browning's web site has a sn search function.
Your question is about the Browning auto-5 shotgun.The age of your Browning cannot be determined without you providing a serial number for your Browning.