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This is a little complicated: A client of mine had a very unusual timepiece, a $20 gold coin that was milled out and had a gold watch movement inside it. This was made by Audemars Piguet, a very fine Swiss watchmaking company. It had a secret latch and hinge that sprung open to reveal the watch inside, when closed, it appeared to be a simple gold coin.
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This is where it got complicated, my client wanted to wear this coin as a wristwatch. This meant that a frame had to be made to hold the coin, and it would need another latch to activate the secret latch. The coin must also be removable from the frame.
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The buckle for the watch was also hand made from 18Kt yellow and rose colored gold. This style of buckle is known as a "deployment" buckle.
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As you can see, when assembled, the face of the coin flipped open to reveal the watch inside.