When Omega introduced the Ploprof 1200M back in 2009, I was actually happily surprised to see that they did such an amazing job. The resemblance with the original Omega Ploprof 600M 166.077 was amazing. On first sight, the new Omega Seamaster PloProf 1200M looked identical to the PloProf 600M version of almost 40 years earlier. On Fratellowatches we wrote about the PloProf watches several times, but never took the time to put the two models together and have a closer look.
For detailed history on the Omega Seamaster Ploprof 600 I will ask you to read this article on the Omega Ploprof’s History, written by Jon Wallis. I will give the highlights of the PloProf history to you in a nutshell, mainly based on what Omega has documented on this timepiece. According to official Omega documentation, it took them more than four years to develop a solution to create a watch that could handle the extreme pressure that a watch needs to withstand when diving at great depths. Even COMEX divers were involved in the testing of Ploprof prototypes during the Janus operation. Already at that time, around 1970, Omega was experimenting with materials like titanium for watches. Less then 10 pieces have been made out of titanium for testing purposes, but never made production since the price of such a watch in titanium would be totally crazy.
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In the end, Omega came up with the following solution: a monocoque case (or monobloc) made of stainless steel with a locking bolt to secure the setting and winding crown. Water is of course one thing, but at extreme depths divers would be working in a pressurized chamber where they breathe a mixture of oxygen and helium. The helium gas is able to enter the watch when it is under pressure, as you probably know if you are into diving watches. Instead of using a helium valve like Rolex did with their Sea-Dweller watches, Omega decided that it would be better to prevent helium from entering the watch in the first place. Omega also wanted to measure the maximum pressure the Ploprof 600M could handle which resulted in a failure of the watch at 1370 meters (or 137 ATM) as the second hand stopped due to deformation of the crystal and case. The Ploprof 600M was taken into production in 1970.
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