From the serial number it's a 14th year gun or 1969.
The missing 10rd magazine, aftermarket stock, bipod, scope and muzzle doohickey all put it in the $225-300 range.
In original all matching configuration it might by worth $325-375 USD in the right sale. If you still have the orginal stock and magazine, return it to original configuration to get the extra money from the sale.Information
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