"NATO" star crown

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Hi folks,
Would one of you Zenith gurus know/mesure the diameter of A3736 and A277 "NATO" crowns ?
Many thanks,
Wolf
Edited:
 
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A277 on mine is 6.25mm
A3736 star crown 6.35mm
Movado silver dial(A3736), sorry too lazy to open to get reference #, 6.30mm same with my orange bezeled version
Best,
David