This is one VERY stunning watch; however, one question: What type of ETA movement is this? Aren't there many different grades?
Great Question...here is some Wikipedia info on the various grades of ETA. They mention the 2824 and 2892, but just as easily could be 7750 as well. 2836 is a variant of the 2824, and the 2892 begot the 2895 (small seconds), 2894 (chrono module), etc.
ETA 2824
One workhorse of the ETA mechanical line is the ETA 2824-2, The 2824 is an automatic winding, twenty-five (25) jewel movement, available in four executions or grades: Standard, Elaborated (improved), Top and Chronometer[5]. 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 Standard grade is adjusted in two positions with an average rate of +/-12 seconds/day with a maximum daily variation of +/-30 seconds/day; the Elaborated grade is adjusted in three positions with an average rate of +/-7 seconds/day with a maximum daily variation of +/-30 seconds/day; while the Top grade is adjusted in five positions with an average rate of +/-4 seconds/day with a maximum daily variation of +/-10 seconds/day. The Chronometer grade must meet strict standards prescribed by the COSC. Chronometer grade movements are serial numbered as that is a requirement of the certification authority. Moreover, it should be noted that the degree of decoration on the movement's parts, generally only an aesthetic improvement, increases as well with the grade.[6]
ETA 2892
The ETA 2892.A2[7] is however, widely considered the more upscale of the basic ETA movements, and it certainly a newer design dating to the 1970's where as the 2824 traces its roots back to the 1950's. The 2892 is fitted with top quality components. The 2892 is an automatic winding, twenty-one (21) jewel movement, available in three executions or grades: Elaborated, Top and Chronometer. The key components which differ at the line of demarcation between Elaborated and Top are the 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 Elaborated grade is adjusted in four positions with an average rate of +/-5 seconds/day with a maximum daily variation of +/-20 seconds/day; while the Top grade is adjusted in five positions with an average rate of +/-4 seconds/day with a maximum daily variation of +/-15 seconds/day. The Chronometer grade must meet strict standards prescribed by the [COSC]: an average rate of -4/+6 with a maximum daily variation of +/-5 seconds/day. The wider range for the Chronometer grade is designed to take into account the differences in a watches rate between static positions, as when the tests are performed, and the dynamic positions as when a watch is actually worn. Chronometer grade movements are serial numbered. Moreover, the degree of decoration on the movement's parts, generally an aesthetic improvement, increases with the grade.[8]
The 2892A2 is regarded by many horologists as being in the same 'quality' range (accuracy and reliability) as the in-house produced Rolex movements[citation needed]. Insofar as accuracy is concerned any movement which is expected to be COSC certified or is in fact COSC certified must meet the same standards. The ETA 2892.A2 is usually found in the more expensive and prestigious watches and brands. Owing to it's relatively slim height of 3.60mm, the 2892.A2 is a favorite of watch brands that market complicated movements such as Breitling with its trademark chronograph (stop watches). Given the slim dimensions of the 2892, it provides a good platform on which to add or build a chronograph complication.
