One had a small seconds, the other a center seconds. Both were powered by a Master Chronometer movement packaged in a 38mm stainless steel case, and had vintage styling that tied them back to the golden age of mid-century watchmaking. Each was also limited to 1,948 pieces. At the time, we assumed that these two 38mm limited were it for the collection. But two days ago, Omega added two new platinum watches to its Omega Seamaster 1948 limited editions – a center seconds and a small seconds, 70 each – following the same pattern. Both of these new platinum pieces are also Master Chronometers, which means that in addition to being certified chronometers, they have been subjected to a rigorous battery of tests, including for resistance to magnetic fields..