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The ETA caliber 2824-2 is perhaps one of the most well-known and most recognized movements in the watch industry. It has been in production since 1982 and was based off of the original Eterna caliber 1427. The “-2” designation indicates that it is the 2nd generation in the evolution of the movement.
There are four grades available with the main differences being how the watches are tested at the factory, the finish, the mainspring, the hairspring, and the anti-shock device used. Let’s compare the grades below:
Standard Grade: Adjusted in two positions; Nickel plated balance wheel; Nivarox hairspring; ETACHOC / Novodiac anti-shock device; polyrubies used for pallet jewels.
Elaborated (Elabore) Grade:
Adjusted in three positions; Nickel plated balance wheel; Nivarox hairspring; ETACHOC / Novodiac anti-shock device; polyrubies used for pallet jewels.
Adjusted in five positions; Glucydur balance wheel; Anachron hairspring; Incabloc anti-shock device; red rubies used for pallet jewels.
Adjusted in five positions; COSC specs; Glucydur balance wheel; Anachron hairspring; Incabloc anti-shock device; red rubies used for pallet jewels.
All grades have the same diameter, height, jewel count, frequency, and power reserve.
The expected accuracy of the ETA caliber 2824-2 depends on the grade.
Standard – +/-12 seconds per day up to +/- 30 sec/day
Elaborated – +/-7 seconds per day up to +/- 20 sec/day
The average for this caliber is the +/12 seconds per day range since most of the 2824-2 movements out in the wild are the Standard grade.
Same Movement, Different Caliber Numbers:
The ETA caliber 2824-2 is supplied to many different watch companies for use in a wide variety of watches. These companies will often put their own branding on the rotor, or make other small changes. This sometimes leads them to creating their own caliber number.
Before the watch industry’s rush to produce and market in-house movements, some watch companies would create their own caliber number to disguise the fact that their watch was using the ETA 2824-2. This isn’t because the 2824-2 was less desirable movement, but rather because much of the watch industry was smoke and mirrors, and also in an effort to create higher prices in the market since nobody knew the cost of the parts within the watches.
Click here for more examples of 2824-2 movements that are branded under different caliber numbers.
Since the patent giving exclusive rights to ETA for the design of the 2824-2 expired, there have been similar movements aka “clones” popping up that are based on this movement: For example the Sellita caliber SW200-1, STP1-11, Valanvron VAL-24, Hangzhou caliber 6300, Seagull caliber ST2130.
Although ETA movements are now unavailable for purchase from ETA, you can still find watch parts suppliers offering replacement movements for sale. The gold tone version (see example below) appears to cost less than the silver (nickel plated) version. Prices generally range from $200-$300 USD, but at the time of this post, the gold tone 2824-2 can be purchased for $236.20 USD here, and the nickel plated for $262.42 USD here.