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: this is a deviation of the mechincal watch measured in seconds per 24 hrs. it basically has to have a deviation of less than -4 to 6 seconds per day (86,400 seconds per day!!! See below for typical standards for specific Omega calibres of watch : this is the amplitude of the rotation of the balance wheel of the watch.
This is the 'heartbeat' of the mechnical timepiece and rotates on an axis.
ETA supplies the overwhelming majority of mechanical watch movements found in Swiss watches.
unless you have a watch an escapement like a Omega Co-Axial (invented by George Daniels) escapement than this value need to be changed because of the radical nature of the escapement (therefore different lift angle) : simplistically, each individual strike of the pallet fork on the balance wheel will give a sound. _______________________________________________________________________________________________________________________ ETA SA (full business name ETA SA Manufacture Horlogre Suisse) is a Swiss producer of mechanical and quartz watch movements.
It is a wholly owned subsidiary of the Swatch Group.
The key components which differ at the line of demarcation between Elaborated and Top are the barrel spring, shock protection system, pallet stones, balance wheel & hairspring and the regulator mechanism.
To illustrate the differences in accuracy garnered by the successive grades, consider the following specifications: The Chronometer grade must meet strict standards prescribed by the COSC.
Given the slim dimensions of the 2892, it provides a good platform on which to add or build a chronograph complication.