- The Blancpain Fifty Fathoms, originally introduced in the 1950s, was designed as a professional diver's timepiece. Initially produced for the French and German military under the name Tornek Rayville, these watches were commonly known as Mil-Spec.

- In 1953, the Fifty Fathoms was released as a 41mm dive watch. It featured a rotating Bakelite bezel and luminous markers on the dial and bezel to ensure readability in the darkness of deep dives.

- However, in the early 1960s, new regulations mandated a change in the luminous materials used, replacing radium with a less radioactive alternative. Ever since, Blancpain incorporated the universal symbol for radioactivity with a cross mark labeled "No Radiations," indicating to the owner that the luminous bezel and dial were safe.

- To commemorate this coveted model, Blancpain released a re-edition of the "No Rad" version, limited to 500 pieces. It featured a larger 45mm stainless steel case and a black ceramic lumed bezel, paying homage to the original Fifty Fathoms. The watch was also fitted with a vibrant orange strap, which complemented the radiation signage on the dial and added a sporty appeal to the dive watch.