omega Co‑Axial Master Chronometer Chronograph 44.25 mm Thanks to this trademarked component called a 'spirate' – a portmanteau of 'spiral' and 'rate' – the Speedmaster Super Racing is the first Omega to offer an accuracy of 0/+2 seconds– ie: it will gain no more than two seconds a day, and lose none.

The Co-axial escapement operates through a system of three pallets that’s separates the locking feature from the impulse. This is done via a pushing action, instead of the sliding action as seen in the traditional Swiss lever escapement. The automatically results in better mechanical efficiency.

Accuracy of a Master Chronometer is independently certified at between 0 and +5 seconds per day variance, which ensures the watch will never lose time and the certified accuracy is superior to that of the general COSC certified chronometers which are between -4 and +6 seconds per day.

The 8912 is a mechanical movement and so are the other 89XX movements. The point of this thread is that the 89XX series mechanical movements are so accurate they near Quartz level accuracy which is simply amazing.

In terms of accuracy, both brands deliver exceptionally precise timepieces, which have a chronometer title. But in terms of accuracy, Omega wins over Rolex as they make both mechanical and quartz watches, which quartz tends to be more accurate than other watch movements.

In terms of overall accuracy, Omega wins, since they not only make mechanical watches but also quite a few quartz watches. Quartz watches, as we all know, are more accurate than their mechanical counterparts. Rolex, on the other hand, doesn't manufacture quartz watches anymore.

A Master Chronometer means that a timepiece has been certified not only by COSC (Official Swiss Chronometer Testing Institute) but also by METAS (Swiss Federal Institute of Metrology), a Swiss government-controlled centre considered to be the height of measuring excellence with stringent and comprehensive certification ...

The smaller contact surfaces and the pushing motion, as opposed to the lever escapement's sliding motion, significantly reduce the friction in the escapement; thus there is less wear and tear on the lubrication, resulting in longer service intervals (allowing a watch to last longer).

A Master Chronometer means that a timepiece has been certified not only by COSC (Official Swiss Chronometer Testing Institute) but also by METAS (Swiss Federal Institute of Metrology), a Swiss government-controlled centre considered to be the height of measuring excellence with stringent and comprehensive certification ...

Are they the same thing? No. A chronometer is a watch that's been engineered to the highest levels of accuracy like the C60 Elite 1000. A chronograph, such as the C3 Morgan Chronograph, is a watch with additional timing functions like an integrated stopwatch.

Omega's Most Precise Movement is Here – the Speedmaster Super Racing

• The Omega Speedmaster Super Racing is accurate to 0/+2 seconds a day, which is not too far from the most accurate watches in existence.
• Right at the 6 o'clock is the date window.

Patek Philippe arguably owns the top-tier of high-horology. Once, the most expensive watch ever sold was a Patek Philippe with many complications and sold for over 11 million dollars, second only to a Rolex that was worn by Paul Newman.