Ref. 2846 Seamaster Crown Variations

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Any thoughts about the crowns on my two 2846's? I do not know the history of the watches, they were both auction finds.

Edited:
 
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They both look like later service crowns. The logo is too round for the 1950's and also I generally see a clover crown on this reference.
 
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Thanks! When you look at the top crown, it does in fact resemble a clover apart from the outer ridge. I haven't seen such a design before.
The bottom crown is indeed a classic clover.