Question about Crown for Omega Speedmaster Calendar - Ref No. 2849-1 SC

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My brother inherited our grandfather's Omega Speedmaster Calendar - Ref No. 2849-1 SC

He is trying to get a replacement crown. I would really appreciate it if any knowledgeable expert would be able to give me the part number and the best place to get it.

Thanks in advance

Tom
 
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ebay is always a good start, one search and you can find a fews available 馃榾.
 
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If you want a period correct example, this is the logo on the crown you鈥檙e looking for: