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**davischevy** · 05-20-2022, 10:19 PM

I stole this from Chevelles.com posted almost twenty years ago by AZCamino.

Codes are two letters like NT where N = January and T = 1970.

Month codes: N January, X February, L March, G April, J May, I June, U July, T August, A Sptember, Y October, C November, V December

Year codes: G 1964,1977; J 1965,1978; A 1966,1979; Z 1967,1980; X 1968,1981; V 1969,1982; T 1970,1983; N 1971,1984; Y 1959,1972, U 1960,1973; L 1961,1974; I 1962,1975; C 1963,1976

The above is for LOF glass. PPG glass is dated differently. In 1966 the codes were a 1 or 2 digit month followed by a single digit year. Example; 85 = August 1965 It appears that PPG later switched to a julian date (day of the year) followed by a single digit for the year. Example would be 2579 for the 257th day of 1969. A reply to one of my posts by Shawn shows examples of this.

Edit: I have since learned that the first two digits are a plant code followed by month of the year and the last digit is the year. So 2579 would be plant 25, 7th month (July), and 1969.

05-20-2022, 10:19 PM	#4
davischevy Senior Member Join Date: Sep 2008 Location: Harrison, Arkansas Posts: 9,881	Re: LOF window codes I stole this from Chevelles.com posted almost twenty years ago by AZCamino. Codes are two letters like NT where N = January and T = 1970. Month codes: N January, X February, L March, G April, J May, I June, U July, T August, A Sptember, Y October, C November, V December Year codes: G 1964,1977; J 1965,1978; A 1966,1979; Z 1967,1980; X 1968,1981; V 1969,1982; T 1970,1983; N 1971,1984; Y 1959,1972, U 1960,1973; L 1961,1974; I 1962,1975; C 1963,1976 The above is for LOF glass. PPG glass is dated differently. In 1966 the codes were a 1 or 2 digit month followed by a single digit year. Example; 85 = August 1965 It appears that PPG later switched to a julian date (day of the year) followed by a single digit for the year. Example would be 2579 for the 257th day of 1969. A reply to one of my posts by Shawn shows examples of this. Edit: I have since learned that the first two digits are a plant code followed by month of the year and the last digit is the year. So 2579 would be plant 25, 7th month (July), and 1969. __________________ other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless.