A propensity to corrode usually is not a selling point for a watch, but it is a compelling feature of the Panerai Luminor Submersible 1950 3 Days Automatic Bronzo 47MM (www.panerai.com). The dive watch, which has a depth rating of about 984 feet and a price of $10,700, features a bronze case that acquires a greenish patina as it ages. The patina will pair well with the green of the dial, while a hypoallergenic titanium case back prevents the bronze from leaving a similarly colored stain on the wearer’s wrist.
