Dave,
The model 99F wasn't available until 1955 and late 55 early 56 for the 308, so I am guessing it is mid fifties vintage. The recoil pad is not factory, has the butt been cut? I should be slighty curved, if it is straight then it has been cut. Regardless being your father's it is priceless. Monetary value will depend on condition, whether the butt has been cut. If it has then the collector interest will be nil and the price will drop. Hope this helps.
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