LOF Codes

LOF Glass Codes for 1953-1996 Corvettes

Originally hailing from Toledo, Ohio, the now-defunct Libbey-Owens-Ford Company produced OEM and replacement flat glass for the construction and automotive industries until 1986 when it sold to Pilkington in the UK. Among its products were windshields and windows for the C1 through C4 generation Corvettes. But how do you decipher the LOF glass codes?

First, find the LOF symbol. To the lower right, you should see a two digit alpha code. The first letter represents the month of manufacture and the second letter represents the year. So, if you had glass with the HA marking it would be July 1953 (C1). In some cases, your generation Corvette will help you determine the proper year code. For instance, GG could be April 1964 (C2) or April 1977 (C3).

LOF Glass Codes GG

Please use the lists below to determine the complete date of manufacture for your specific LOF glass codes:

First Alpha Code
(Month of Manufacture)

A — September 1958-1996
C — November 1953-1996
E — September 1953-1957
F — October 1953-1957
G — April 1958-1996
H — July 1953-1957
I — June 1953-1996
J — May 1953-1996
K — April 1953-1957
L — January 1953-1956
L — March 1957-1996
M — February 1953-1957
N — March 1953-1956
N — January 1957-1996
T — August 1953-1996
U — July 1958-1996
V — December 1953-1996
X — February 1958-1996
Y — October 1958-1996

Second Alpha Code
(Year of Manufacture)

A — 1953, 1966, 1979, 1992
C — 1963, 1976, 1989
G — 1964, 1977, 1990
I — 1962, 1975, 1988
J — 1965, 1978, 1991
L — 1961, 1974, 1987
N — 1958, 1971, 1984
T — 1957, 1970
U — 1960, 1973, 1996
V — 1956, 1969, 1982, 1986
X — 1955, 1968, 1981, 1994
Y — 1959, 1972. 1985, 1995
Z — 1954, 1967, 1980, 1993

While we’re on the subject, take a peek to the other side of the LOF logo. You should see one of three designations: AS1, AS2 or AS3. What do they mean?

LOF Glass Codes ASI

AS1 is the best, passing all safety inspection tests. It’s more expensive to manufacture, and although it can be used in any part of the car, engineers mostly use it for the windshield.

AS2 comes in second. Although it passes most tests, it fails the steel ball drop and thus cannot be used for windshields. Instead, you’ll find it on rear or side glass.

AS3 is darker, usually referred to as privacy glass. It can be installed above or behind the driver. Sometimes you’ll find it installed as hardtop windows.

We hope this helps to demystify LOF glass codes. Looking for replacement glass for your Corvette? Corvette Central offers a full range of OEM and reproduction glass for windshields, doors, rear windows, and even vents.

C1 (1953-1962): Windshield Glass, Door Glass
C2 (1963-1967): Windshield Glass, Coupe Rear Glass, Door/Vent Glass
C3 (1968-1982): Windshield Glass, Rear Glass, Door Glass
C4 (1984-1996): Windshield Glass, Rear Glass, Door Glass

8 thoughts to “LOF Glass Codes for 1953-1996 Corvettes”

  1. My corvette has marked on the windshield: “SAFETY PLATE AS1U” Is this an original windshield? It is a 1958 model.

      1. On a C1 the date code is below the LOF logo, not beside as pictured on your site. On the above question the writer said it has an AS1U, he is missing one letter. There should be two letters after the AS1, mine has AS1TV, although mine is on a 58 built Jan 1958. According to your chart that should be December 1956.

  2. Nice story Marc, I’ve got a ’65 vin #104084, it also has its original glass exept for my LH vent window, date is jan ’65. Maybe somebody broke this in the past.

  3. I have a late production 1965 Coupe (VIN is in the 15800s) that was originally equipped with the L78 396/425hp big block. The car is well used and the big block is long gone. It now has a 1968 CE (crate engine) 327. Also it sports flared fenders over wide American mag wheels and custom Burgundy paint. Truly a hot rod Vette from the 1970s! For all that the car has been through I discovered that it still has its original windshield date coded GJ (April 1965) and all other original glass. Thank you for the information! -Marc in SoCal

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