It's only worth what a buyer is prepared to pay !!
Browning.com has a sn function listed under customer service.
You will have to call Browning for an answer.
Browning first, then MidWest Gun Works.
made in 1961
With the serial number L52017,your Browning auto-5 light weight model shotgun was made by FN of Belgium for Browning in the year 1955.