The 44.25mm case Speemaster Co-Axial Chronograph model wears a lot more comfortably thanks to a number refinements. For one thing, the case is 0.8mm thinner - due in most part to the more curved versus boxy look of the rear sapphire crystal. You also have new end-links for the bracelet, which point down versus straight out, allowing the watch to fit a lot more comfortably when worn.
Omega Speedmaster Racing Co-Axial Master Chronometer in steel, two-tone steel and 18k Sedna gold, and in all Sedna gold.There will be versions on straps or on steel bracelets. Each is pretty handsome, although some versions are going to be a bit more mainstream than others. More design refinements can be found on the dial and bezel. The subdials are a bit larger, which is a good thing; the lume-filled, applied hour markers now have slightly tapered ends; the date window is neat-looking and tapered; and the bezels use interesting new production techniques.
The automatic movement is visible through the now more rounded sapphire crystal caseback. It operates at 4Hz (28,800bph), which is more than the 3.5Hz of some previous Co-Axial Escapement Omega movements. The escapement uses a silicon balance spring and has 60 hours of power reserve between two mainspring barrels. The movement has the time with subsidiary seconds dial, and a full 12-hour chronograph with both the chronograph minute and hour counter hands in the same (right) subdial. It has the date at 6 o'clock. The movement is both METAS certified and COSC Chronometer certified.
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