For just this once, we turn Speedy Tuesday into Seamaster Tuesday, to introduce you to the new Omega Seamaster Planet Ocean Deep Black collection. However, before we take a thorough look at the new Omega Seamaster Planet Ocean Deep Black, lets give you some background on the Seamaster collection and the Planet Ocean in general.Seamaster HistoryYou probably know that Omega introduced the Seamaster in 1948 and that it looked nothing like the dive watches of todays collection. Actually, those first Seamaster models were based on Omega watches that were supplied to the Royal Airforce during WWII. The British required reliable watches with high precision movements and, water resistant cases. Ren| Bannwart, head of the creation department at that time and responsible for the Omega Centenary models, was asked to come up with a watch that would be robust and sporty. However, at that time, even though the lugs were beefier than the Centenary and the bezel and case were much thicker, it still doesnt really correspond with the idea of a water resistant watch that we have today. Water resistant was also quite relative. Weird, as Omega knew how to make divers watches already since 1932 with their rectangular Marine model.Omega Seamaster 300, CK2913. Image by AntiquorumNo, the divers watch that all the current Seamaster 300, Seamaster 300M and of course the Planet Ocean models come from, was introduced in 1957, together with the Railmaster (CK2914) and Speedmaster (CK2915): the Omega Seamaster 300 (CK2913).The Seamaster 300 from 1957 was water resistant to 200 meters (no typo) but named 300 meters as it is said to have out performed the testing equipment at the time. Those were only limited to 20 bars. The crown system (Naiad) and high resistance of the crystal were for the large part responsible for this. Furthermore, the Seamaster 300 had of course a rotating bezel with diving scale on it. The bezel also tightly locked the super domed crystal on this watch.A 1970 Seamaster PloProf with its modern (2009) version on the right.Omega kept on developing their divers watches, with the help of COMEX and Jacques Cousteau. One of the most famous and talked-about divers watches was the 1970 Omega Seamaster PloProf (we did an in-depth review of the modern and vintage version here).