really early oil cap /6

Nice & oily / dirty, so it should clean up great. I'll put it in the parts washer.

That is the correct cap.

View attachment 1715081303
I got one of those too. C.A.P. I think maybe too late for your app?
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The 65 wagon I bought came from CA - always a CA car - had thE one you have, so probably correct for a 65-later