Crown for 136.017 cal. 613

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(Also posted in the Cosmic Club thread )

I found my grand dad’s ref. 136.017 (cal. 613, gold-plated) after my mother’s passing a few years ago. Decided now to fix it up as the glass and crown are not original, and the watch is just in general need of a service.

Now to my question: what are the chances to find a proper replacement crown? My watch guy has the proper glass but I’m interested in finding a proper crown. Is there an article number I should be looking for?