Quote Originally Posted by J. Baker View Post
P would be 1963, not 1964
S would be 1965, not 1968

As for the value of the OP's rifle, it's really hard to say without knowing anything about it's condition. Assuming the bluing is good (90% or better) and the stock isn't all beat up I'd say somewhere in the neighborhood of $250-300.

These older Savage 110's aren't nearly as desirable due to several significant differences between them (pre-1966) and newer models (post-1966). The triggers, stocks, bolts and barrels are vastly different, are not interchangeable (for the most part), and there's no aftermarket support for the pre-1966 stuff.
Looks like Savage skipped the letters O and Q for date stamps. That would align your list to the information I posted. Thanks for the scan. Great info.