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
about 1960
the year of manufacture is now still unknown.
You will have to call Colt.
1951
You will need to call Glock
March 19th, 1997
1955
No serial number provided.
No way to answer without the serial number.
@ 1970
You will have to call Colt to find out.
1950