In the above chart we can notice a few variables and differences in construction. All these differences are part of the grading process.
However, when grading an Omega movement, we have to take in consideration more then what we see.
Just to name a few: Balance cock shape, Regulator, Setting mechanism, Bridge shape construction, Movement finishing, Case material, Dial, Handset, etc.
Except A Quality, each grade has it's own declination. For example, in 1894, the Bs declination was the top of the B Quality, found only in gold pieces, while the DD declination was the top of the D Quality production.
In a following chapter we will focus on the various Omega balance cocks, regulators and their evolution, in order to determine jewel count, caliber and correct caliber abbreviation.
*** Although a work in progress at the moment, a wider illustrated chart, containing at least the 19" caliber family, caliber abbreviation and technical specs, should be available by the end of the year.
If you wish to bring your contribution to the project, don't hesitate to send us pictures with your Omega pocket watch, including case and movement by email, at: [email protected]