Value is too difficult to be accurate without seeing the gun. Condition which includes the amount of original finish and original configuration will determine value. Auto 5's with poly-chokes, compensators and recoil pads (other than Mag 12's) will reduce value. Near mint guns and original box will command an extra premium. Recommend taking it to a gun shop for appraisal.
No such A5 model number.
This gun was made in 1963. It is a "Light Twelve" model
How do you remove the breech block on a Browning A5 16ga shot gun
the model 775 savage was contracted by browning based on their a5 design.
Blue Book of Gun Values is a good place to start.
Try the blue book of gun values base on condition
Blue Book of Gun Values, call browning.
A5
This gun was made in 1961
This gun was made in 1972
75-575 usd
350-550 dollars,depending on overall condition.