Not terribly long ago, I got a 3970R (second series) with a solid case back. I know that Patek also manufactured this reference with a sapphire case back. Does anyone know if it is currently possible to get a sapphire case back for the watch, whether from Patek or otherwise? I wouldn't want to adapt the original case back that I have, but rather get a separate one with the sapphire window.
Many thanks for any guidance. And because people like pictures, I've included one here.
Bob