Here this listing of serial #'s fir the Remington Woodsmaster 742
Serial Number Blocks:
1951-1967 1,000-541,000
1968-1975 6,900,000-7,499,999
1975-1978 A6,900,000-A7,499,999
1978-1981 B6,900,000-B7,499,999
Just Find where you number falls in line with.
Hope this helps
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