[Discussion] What are your favorite SOLID casebacks?

I love an exhibition caseback as much as anyone, especially for decorated or beautiful movements. However, I think solid casebacks can be pretty nice as well and can show a lot of personality. For brands using undecorated third party movements, a cool engraved caseback can be cooler than showing a standard miyota movement or something. Plus, solid casebacks can be tougher and make the watch a bit thinner.