What would be the value of a Browning auto 5 made in 1948 in good condition be?

Your Browning auto-5 shotgun was the first year importation was resumed with F.N.of Belgium after World War II.This shotgun will range in price from 500-650 dollars,for a plain barrel model.A matted rib barrel model will bring between 700-850 dollars,and a vent rib barrel model will bring between 600-750 dollars in the condition that you describe.