You will have to call Browning with the sn to find out.
It was made in 1959
This was made in 1926
Your serial number indicates that your Browning auto-5 shotgun in 16 gauge was made in the year 1937.
With the serial number that you provided,your Browning 16 gauge auto-5 shotgun was produced in the year 1929.
With the serial number that you have provided,your Browning auto-5 shotgun in 16 gauge was made in Belgium for Browning in the year 1926.
I have a belgium 12 gauge browning shot gun with the serial #B67119. I am trying to find out what type or size choke it has
Impossible to answer without the serial number.
You will have to call Browning.