What is the value of an A5 Humpback Belgium made Browning with a 3 inch ribbed barrel made in 1958 serial number 28364?

Your Browning auto-5 shotgun should have the serial number prefix of 8V.This would indicate that your Browning was a Magnum model auto-5 because of the 3in.chamber.This was a new model which was first made in the year 1958 and seeing that your shotgun has a vent rib barrel;then the value will be between 450-750 dollars for a shotgun showing between 60%-90% of it,s original finish and a good bore.