Does anyone know if any authorised repairer or agent can obtain parts for VC yet please?

I am looking for a crown for a reference 6397, the case for which was made in Geneva in the early 1960s by a company called A. Eggly & Cie, which was on Rue Dassier 9. Sadly, that company no longer exists.

Alternatively can I trace the manufacturer of that (specially shaped) 18ct winding button which was made for Eggly's cases?