Those are the correct style of crown for the watch. However, you can do better on price by ordering from Ofrei.com or CousinsUK.
Get the case reference number from the inside of the caseback, or better yet have your watchmaker do it at the next service.
If the crystal has the "Ω" in the middle it is likely original and should just be polished. Otherwise, you should be able to get an OEM crystal from the above suppliers. They came with and without the magnifiers, so that would be your choice.
Take care,
gatorcpa
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