Designed in 1954 for divers as an underwater watch. The watch is sought after for its resistance to water and corrosion.

Reimagined, with a green bezel, in 2003 on its 50th anniversary. It then underwent another evolution in 2010 which paired the green dial with a green ceramic bezel. The all green design coupled with an overall larger watch saw it quickly adopt the nickname 'The Hulk'.

Production of the 'Hulk' ceased and the watch stepped aside in 2020 for the latest, and still current, version now once again with a black dial meaning the pre-owned market is the only way to find one. It remains a very sought after timepiece and really rather collectible.