Your Browning light weight auto-5 shotgun,which was made in the year 1963 will bring between 250-550 dollars,depending on the type of barrel that is with the shotgun,and the overall condition of the shotgun in question.
The light 12 was introduced in 1947 until 1998 when the gun was discontinued as a regular model in the Browning Line. Japanese production began in 1976, all before then were Belgian. A few custom guns were made in Herstal after 1976, but they were exceptions and special commemoratives.
The Browning light weight 12 gauge shotgun was made by FN for browning from 1947-1976.These shotguns were also made by Miroku of Japan from 1976-1998.If you would supply a serial number to your browning shotgun then I would be able to identify the exact year of production.
Your prefix to the serial number,which is read as Zero G indicates that you have a Browning auto-5 light weight model shotgun,that was made in the year 1960.The letter G designates that your shotgun is a light weight model.