Mossberg made them under the Western Auto name.
To determine the exact value of a Browning automatic 20 gauge shotgun made in Belgium, a couple factors would need to be taken into consideration. Some of these things are the age and condition of the shotgun.
You will have to tell us who made it in order to get an accurate answer. westernfeild
50-350 usd
$1600 if in excellent codition
A semi-automatic shotgun made in 410, 28, 20 and 12 gauge.
With the serial number that you provided,your Browning auto-5 12 gauge shotgun was made by FN of Belguim for Browning in 1947.
If it is an Automatic - 5, it was made in 1925
50-1500 USD depending on specifics.
With the serial number that you supplied,your Browning 16ga auto-5 shotgun was made in the year 1948.
Your serial number indicates that your Browning auto-5 16 gauge shotgun was made in the year 1947.
100-1000 USD or so