To your question, all that can be said is the crown and pushers appear to be correct for the reference. But, the period-correct crown and pushers currently seen on the watch are also essentially identical to the modern production parts. Regardless, given that these parts are typically replaced at a service, and that the case back gasket takes a considerable amount of time to emulsify as it has in this example, then it's safe to say it has not been serviced in a significant amount of time. So I would say that it is likely that the crown and pushers have likewise not been replaced recently. The corrosion around the base of the pushers, and the sharper edges around the rim of the crown also seem to agree that they are period correct and possibly original.
Short answer: I think those pieces are probably original. As does everything else, aside from the bezel and bracelet as already mentioned. Case looks decent too.
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