Thanks for looking. A friend of mine has asked me to sell this watch for her, and my first hurdle is that the battery needs changing. OK, say I, let's have a look. It's a Choppard Happy Diamond watch, where the movement is in a separate case, within the main case, so that it moves around. If that makes sense! It's nice - all white gold and small diamonds, but can I get outer case open? Can I hell.

The outer case seems to be one piece, no screw back. Nothing between the lugs. The case back is crystal, and there seems to be no thread to remove/unscrew it. Anyone know?

Or... should I hit it with a hammer, remove the diamonds, and sell it as stones/metal?