What is the value of a 1960 Belgian Browning Auto-5 Light 12 shotgun serial 0G4509 with a gold-plated trigger with a 26 inch barrel in good condition?

Only condition can set a price for this gun. Typically these guns with a normal amount of handling marks and finish loss, will fall in the 85-90% bracket of remaining finish. Light 12's will run $400-$1000 depending. Mint in Box could go upwards to $1500+