This gun was made in 1963
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. Condition and age is also a factor. Auto 5's with recoil pads (other than Mag 12's) poly-chokes and compensators will reduce value. Recommend taking it to a gun shop for appraisal.
You can also do your own investigation by looking at other models being sold that are in the same condition as yours. Try the gunbroker.com or a periodical called "The Gun List"
You can also reference the Blue Book of Gun Values which can be purchased on line at various retailers.
Bout $500.00 if in fair shape.
A twelve sided shape is a dodecagon.
a twelve sided shape is called a dodecagon.
what is a shape with twelve faces called
It is a dodecagon
dodecagon
a dodecagon.
Dodecagon
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dodeckagon
A dodecagon.