Browning.com has a sn function under customer service.
No way to answer since a serial number was not provided.
Basically impossible to value with just the serial number.
Your Browning auto-5 magnum shotgun was made in Herstal,Belgium by the firm FN(Fabrique Nationale)for Browning in the year 1965 with the serial number that you have provided.
What is the year of mfg. of FN pistol Model 1910, with serial number 583500
The 5G prefix to the serial number indicates that your browning was made by FN of Belguim for browning in 1965.
Made in 1969, this gun was manufactured in Liege Belgium at the Fabrique Nationale Firearms plant.
No FN sn data available.
Browning.com has sn data under customer service.
1984
I can say that it was made after 1977, but for more specific information, you will have to contact browning customer service.
You must call Browning. SN does not follow normal convention.
This gun was made in Liege Belgium at the Fabrique Nationale Gun Factory in 1962.