Well it's pre-1994 for sure. There is a foil tag inside the lamp near the screw base with "SR###" on it. The two or three digit number code is the date code, which Dave or someone else can date. Sylvania lamp packages actually tell you hove to decode it but I'm too lazy to scratch my head and try to figure out the code. Doesn't mean that much to me when I can have someone else date it for me lol.