http://www.thewatchbox.com The Panerai Radiomir Composite PAM 504 combines the look of a vintage Panerai combat dive watch with the hottest watchmaking technology of the 21st century: ceramic. Ceramic, which is an inorganic metallic compound, packs the scratch resistance of sapphire crystal; only a diamond or a *huge* knock can mar its surface. But ceramic can be prone to fracture. Enter Panerai's "composite" technology. Composite is a material formed by chemically transforming the outer aluminum shell of a Panerai Radiomir 504 case into a thin layer of ceramic. Underneath the top layer, the aluminum core remains fully metallic and intact. The result is the best of both worlds: the scratch resistance of ceramic and the shatter resistance of aluminum. It's also a very light material. On the wrist, the Panerai Radiomir PAM 504 feels as gossamer as a titanium case, but it packs the durability of full kiln-fired ceramic. The 47mm cushion case of the Radiomir wears even more comfortably when rendered in composite. Even better, the flat profile of the manual-wind PAM 504 means this is the rare Panerai watch that plays well with long sleeves and dress cuffs. Panerai imbues the Radiomir Composite PAM 504 with a vintage vibe that should resonate strongly with the "Paneristi" fans of the brand. A simulated aged radium "dirty dial" mimics the look of a true 1930s, 1940s, or 1950s Panerai combat dive watch that has weathered the onslaught of years. The evocative untreated calf leather strap of the PAM 504 compounds the vintage watch look, and off-white stitching finishes the effect. Inside the 47mm composite carapace, a Panerai in-house caliber P.3000 provides steady timekeeping with a free-sprung escapement, three-day power reserve, and gorgeous finish. A sapphire case back allows the owner and his companions to admire the works. This Panerai Radiomir Composite PAM 504 is available with full Officine Panerai factory boxes, technical manuals, documents of provenance, and accessories. See it in high resolution images on our website, www.thewatchbox.com. Video and content by Tim Mosso.