Omega Geneve dynamic ladies crown size help

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Dear all, I have purchased a lovely dynamic ladies for my wife to match mine…
Problem is it came without the crown.
I have retrieved the split stem bit, now I am in search of a crown. May I please have some help/advice on the size, number or how to search for it.
All help appreciated.
Photos attached for reference.
 
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Chris, I may have a used spare. Are you in the UK? If not, I can at least measure it.