Panerai Luminor Submersible 1950 3 Days Automatic Bronzo PAM00382 is the first ever Panerai with a bronze case. Incidentally the Panerai bronze alloy is significantly more reddish than the bronze used Anonimo or Gerald Genta, which I assume means it has a higher proportion of copper.
Though bronze is a primitive alloy, it has certain useful qualities. Marine bronze like the type used in the Panerai Bronzo offers superior resistance to corrosion and salt water, compared to steel. But untreated bronze as used by Panerai PAM382 will acquire a patina, which is actually oxidation, over time. Once the surface layer of bronze has oxidised, it forms a protective layer over the rest of the metal.
This replica Panerai Luminor Submersible 1950 watch is a prototype that has been shown to members of the press around the world. Though the patinated Submersible Bronzo looks somewhat like a grimy watch, it is actually attractive. The surface is variegated, with spots and patches of different shades. It sounds almost like the description of skin ailment but as the cliche goes, the case has character. And the resulting patina on the case matches the green dial perfectly.