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It's not only the incorporation of a co-axial escapement . . .

 

. . . that renders this third-generation Speedmaster movement compelling - it's also resistant to magnetism and, in a nod to vintage sensibilities, the resonant frequency has been lowered to 3 Hz, same as cal 1861/1863.  Hash marks indicating a third of a second will mirror the sweep of the chrono hand. 

Up until now most movements incorporating a co-axial escapement have been tuned to 4 or 3.5 Hz.  Many watchmakers don't have timing equipment that permit accurate testing (3.5 Hz tuning is unique to Omega).  It's noteworthy that cal 3861 movements can be accurately assessed by any watchmaker.  Whether they can work on them is another issue, but at least an owner will be able to visit his local watchmaker and receive a meaningful timing sheet. 

Art

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