With a 5 digit serial number it's a pre-66 model, see the 110-Series forum (covers ALL 110 series rifles) for more info. If you post there I can help you ID year of manufacture.
There should be a date code on the barrel. Look for an oval stamp with 1 or 2 numbers followed by a letter. The letter indicates the year.
K == 1959
L == 1960
M == 1961
N == 1962
P == 1963
R == 1964
For 110s manufactured prior to Gun Control Act of 1968, the letters started with "I" which was 1957. Dating the early 110s has been covered many times in the correct forum as I previously indicated.
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