After reading and searching, it appears mine is period correct for 1967, but it appears to be in great shape. I just got back from a 4 day fishing trip and it's dry.
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I'm thinking the Snickers wrapper ended up down there when they replaced the deck. I don't know when that was.
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Either way, my boat was likely stored under cover most it's years and by the seats and the vinyl on the side panels, it was freshened up at some point.
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I see no reason to replace it.