Tudor 7929 movement identification

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Hello folks!

I could use a helping hand identifying the movement in this 1957 Tudor Oysterdate, ref. 7929.

I’m trying to source the correct crown and stem, so it would be really helpful to know which stem fits the movement. I’m also unsure what crown measurements would be correct for this reference, and I haven’t been able to find much reliable information on it online.

I’ve come across quite a few similar-looking movements, but I haven’t seen this particular calibre identified anywhere. It looks like it may be an outsourced ébauche, but I haven’t been able to identify the movement or its base calibre.

Any Tudor scholars, vintage Rolex/Tudor specialists, or technical experts able to shed some light on this?

I’d really appreciate any information or pointers.

Thanks for looking!

Ouss.