Three years later, the Swiss brand began developing a highly functional watch to replace the Oyster Prince Submariner Reference 7928, which was the Navy’s standard watch at that time. The first phase of development led to various prototypes and a patent for an unprecedented function. The ambitious project with the codename “Commando” was never realized, but the plans were carefully preserved in the company’s archives. The novel component was a hinged mechanism on the case that could be unlocked to reset the bezel and locked to secure the bezel in place. Patented in 1968, the hinged mechanism was also intended to simplify maintenance and servicing… More here.
Almost universally derided, but I got a long look at one yesterday and it is surprisingly lovely up close.