2 Answers

Each reference had silver, black, blue, and salmon dials; link while these dial variations weren't necessarily link matched to a metal, the combos marque montre luxe pour homme were certainly meant to look good together; for example, salmon or blue dials are only found with white metals.

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