The Fifty Fathoms 70th Anniversary Act 3 is clothed in 9K Bronze Gold, a patented alloy enriched with 37.5% gold (hallmarked 9K), copper – 50%, allowing it to be called "bronze" – silver, palladium and gallium. Designed to offer a pink hue and pleasing aesthetics, this type of bronze stands out by the fact that it can be worn in direct contact with the skin, unlike traditional bronze, not to mention that it has a longer lifespan, since oxidation to a verdigris colour is prevented by the addition of gold.
Issued in a 555-piece limited edition, the Fifty Fathoms 70th Anniversary Act 3 is presented in a box inspired by a historic camera housing, echoing Blancpain's ocean protection initiatives. Since underwater photography developed at the same time as the diver's watch, it indeed helped highlight the discovery of the seabed. Thus uniting the best of two eras, this commemorative timepiece continues to write the history of the world's first true diver's watch.