Window LOF Codes

Many parts on the GTO were date coded at the factory.  Most understand how to read the date code on engine and transmissions.  Here is how to read the date codes on the glass codes and locations.  The following is the decoding for LOF (Libby) Owens Ford) glass from 1963 thru 1972. The location of  the codes vary with each piece, just look for the LOF symbol. Generally all of the side glass had the same date, about 60 days before build, and the windshield was 30 days or less from build.

L-O-F: Libby Owens Ford Manufacturer

AS: American Standards Association of Classification

AS1: Windshield Glass

AS2: Body Glass

M54: Manufacturer's Model Number

SOFT-RAY: Tinted

MONTH YEAR

----- ----

N   January                                            C  1963

X   February                                          G  1964

L   March                                               J   1965

G   April                                                 A  1966

J    May                                                 Z   1967

I    June                                                  X  1968

U   July                                                   V  1969

T   August                                             T  1970

A   September                                       N  1971

Y   October                                            Y  1972

C   November

V   December

Example: A code of XJ would be February, 1965.

A code of CA would be November, 1966.