Help with determining correct crown size.

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I've been trying to locate the correct crown for my seamaster calendar 2867-4.
It's an unusual reference with a 38mm case and I'm having a difficult time determining the correct crown size. I believe it's a clover crown but that's as much as I can tell. My guess is around 5.3mm but I don't really know.
The crown that's currently on it is 4.8mm and doesn't appear to be correct.