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The 1964 Coin watch, on the link other link hand, is a very famous creation. link This case-back-less watch was created with an ultra-thin movement set inside an authentic gold US$20 Double Eagle coin. It also graced the wrists of US presidents and prominent figures, like Nobel Prize laureates.

According to Panerai the key to this characteristic is the composition of the alloy which is 75 gold 24 copper whose presence link you'd expect due to the material's deep red coloration but also a small amount of platinum 0.4. It's this hint of platinum matched with a high concentration of copper a ratio fine-tuned at Panerai's Laboratorio link di Idee that accounts for what Panerai describes as its "unique tone and an extreme degree of mechanical and oxidation link resistance."