224.30.55.21.04.001Ref

The Seamaster Ploprof 1200M inherits its predecessor's unique case design, featuring a screw-in crown positioned at 9 o'clock under a protective buffer that grants freer wrist movement and blocks accidental manipulation. Adjustments for time and date involve unscrewing the crown and pulling it to the correct position; the Co-Axial calibre 8500 enables independent hour-hand movement for different time zones or daylight saving time. At 2 o'clock sits a bezel-release security pusher with an orange anodized aluminum ring, which when pressed allows the bezel to rotate in either direction and lock securely, while a helium escape valve automatically operates at 4 o'clock to release helium atoms during decompression for divers using diving bells, and the watch, reference 224.30.55.21.04.001, echoes the original's robustness and water resistance while benefiting from the 2007 Omega Co-Axial calibre 8500 with free sprung balance, a movement created from scratch by Omega and a cornerstone of its mechanical watchmaking revolution since 1999.