Någon som vet vilken av nedan standard Black Bayen har på urverket?
- 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 +/-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. 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.
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