What is a 1953 browning model a5 magnum 12 gauge 3 chamber semi auto worth?

Lets first say that the Browning auto-5 magnum model with the 3inch chamber,in 12 gauge was not available until 1958.If yours has a plain barrel and shows between 60%-90% of its original finish,then the value will be between 365-525 dollars.If it has the vent rib barrel,then the value will be between 450-750 dollars for the same amount of finish.