The value is dependant on three things. Condition, condition, and most of all condition. Anyone would need very good pictures or a hands on evaluation to make a determination of value.
200 usd
Browning records of serial numbers on the 1910/1955 model are vague before 1966. They estmate that number 500,000 was made around 1965, and that 550,000 was the beginning of serial numbers made in 1966. Yours is probably 1965.
50-600 usd
100-1000 USD and up depending on specifics
The 5G included in the serial number indicates that your browning lightweight 12ga.was made by browning in 1965.
I bought mine in 2005 with the zippered pouch and the manual for $365. Condition was 96%, function perfect.
Frederick Browning died on 1965-03-14.
Need a description of the finish, condition, barrel length, box, papers, etc..
Browning didnt start recording dates on these until 1965. Probably 1956-57 would be a good date. Try the link below.
1965 1965
Days of Our Lives - 1965 1-1910 SUSPENDED was released on: USA: 4 September 2012
Your browning model auto-5 magnum 12ga shotgun was made by FN for browning in 1965.