What time is it? Watches and horology

There are several different grades of each ETA movement. For the 2824 there are four grades:

STANDARD GRADE: This grade is adjusted in two positions, specified with an average rate of +/-12 seconds per day, with a maximum daily variation of +/-30 seconds.
ELABORATED GRADE: This grade is adjusted in three positions, specified with an average of +/-7 seconds per day, with maximum daily variation of +/-20 seconds.
TOP GRADE: This grade can be adjusted in 5 positions, specified with an average rate of +/-4 seconds per day, with a maximum daily variation of +/-15 seconds.
CHRONOMETER: This grade, unlike the others, is always serial-numbered
as a result of the requirement of the certification authority. It is
also the grade that must meet strict standards prescribed by the COSC
(Contrôle Official Suisse des Chronométres - Official swiss
chronometer testing institute)

Differences between the Grades Of The ETA 2824-2
STANDARD GRADE AND ELABORATED GRADE
Mainspring - Nivaflex NO
Collet - Nivatronic
Balance - Nickel gilt
Hairspring - Nivarox 2
Balance Staff - Epilame-coated
Shock protection - Etachocs
Pallet Stones - Polyrubies, Epilame-coated
Hairspring heat treatment - Etasable

TOP GRADE AND CHRONOMETER GRADE

Balance - Glucydur gilt
Collet - Nivatronic
Mainspring - Nivaflex NM
Shock protection - Incabloc
Hairspring - Anachron
Balance Staff - Epilame-coated
Hairspring heat treatment - Etasable
Pallet Stones - Red ribbies, Epilame-coated

The main reason manufacturers are moving away from ETAs is because they got bought by the Swatch group who are restricting supply of parts and thus controlling who can/cannot service a watch. If Tudor can no longer service their own watches in-house it fucks their brand. Swatch Group knows this.

Source

Cartel investigation