Actually, the key to manufacture date on your Remington Nylon 66 is not the serial number, but a stamping on the barrel. There will be two letters, the first being the month, and the second being the year. Here's a quick rundown. B=Jan L=Feb A=Mar C=Apr K=May P=Jun O=Jul W=Aug D=Sep E=Oct R=Nov X=Dec As you will note, this forms the acronym BLACKPOWDERX, which is easy to remember. The year codes are E-1958,F-1959,G-1960,H-1961,J-1962,K-1963,L-1964,M-1965,N-1966,P-1967,R-1968, S-1969,T-1970,U-1971,W-1972,X-1973,Y-1974,Z-1975,O-1977,Q-1978,V-1979,A-1980,B-1981,C-1982,D-1983, E-1984,F-1985,G-1986,H-1987,I-1988,J-1989,K-1990. Note that there are duplicates. Early guns had no serial number. Mid-production guns had no-prefix serial numbers. Later production guns had A-prefix serial numbers. Light or partial stampings can be confusing. View carefully with a magnifier. The two letters are right in front of the rear sight along the barrel on the left side of the barrel. If you have any questions or comments, you can e-mail me at paladin@outdrs.net. Hope this helps. John
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