Joe,
Were the OEM windshields that you have seen been marked L-O-F (Libbey-Owns-Ford, which has been owned by Pilkington since 1985), FoMoCo (Ford Motor Company), or Ford Glass Company (maybe the Edward Ford Plate Glass Company, which became the "F" in L-O-F around 1930)?
My 1950's glass is usually marked L-O-F (I guess this was the marking L-O-F put on OEM GM glass at that time).
Tim
