Help me find the right crown and more

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Hi folks,

I have the Cosmic Moonphase, 2606-4, with an aftermarket crown. Does anyone know what the part number would be for the original crown to this watch? And where I can find it!
Side question: Can anyone suggest a leather strap buckle would be original to this watch? Or atleast period correct.
Side q2: Is the bezel for my model solid gold or one of the filled/capped or plated variants?

Thank you!