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Walter - I didn't realize you were looking for the brand. If I had to make a guess, I would say Perko. Whaler widely used their products at that time. I will look at mine the first chance i get.
The original fill fitting on these boats can be seen here. It has a cap with tabs on it instead of requiring a key, and there is a raised rim around 3/4 of the outer diameter. Perko still makes one similar, although now the outer ring and tabbed cap is black plastic.