78 Is also my birth year. 1976-1977 are the "engraved" weber logo lid vents with the "elongated" b in Weber and have the small turn tab on the lid vent. The bowl vents have the large dual tabs. 1978 is supposed to be the dateless "modern" lid vent with the embossed Weber logo and wide turn tab. Incidentally, anyone see a Lime kettle with the "1978" vent? I've yet to see one. There are yellows, reds, chocolates, blacks, dark blues, and dark greens with that vent, but haven't seen or come across a lime green one with that vent yet.