The digits that you "XX" out. Are those alpha followed by a number? In 1963 the serial numbers changed so that they ended with a letter followed by a number. The letter indicated gauge. For example 12 gauge was indicated by "S". The letter was followed by a digit indicating year of make. For example "S3" would be a 12 gauge made in 1963. Twenty gauge was "V".
It changed again in 1969 and again in 1975.
Hope this helps.
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