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).
Please use the lists below to determine the complete date of manufacture for your specific LOF glass codes:
First Alpha Code
Second Alpha Code
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?
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