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Help needed for identifying flat foot crown

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Hi all, I have four, 24 tooth, flat foot crowns which all measure 6.72mm. Three of the crowns have a height of 3.83mm which I believe to be correct for cal. 321 Speedmasters, but one measured at 3.34mm in height, so I’m not sure about the shorter one. If anyone could help I’d appreciate it.
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w154
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Can you measure the thread size of the stem ? That will differentiate immediately between Speedmaster, Seamaster, and Railmaster.
 
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w154 w154
Can you measure the thread size of the stem ? That will differentiate immediately between Speedmaster, Seamaster, and Railmaster.
That’s a great piece of information. Unfortunately it doesn’t have a stem, but could you please tell me which watches correspond to which thread sizes of stems?
 
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