Caliber Comparisons: ETA 2824-2 vs. Miyota 9015

At Aquacy, we believe that choice is important when deciding on a watch. That’s why the new Aquacy 1769 automatic dive watch is available with 14 different dial options and every watch is shipped with an extra silicone strap for when you want to swap out your metal bracelet for a different look. Aside from external options, the self-winding Aquacy 1769 diver is available with either an ETA 2824-2 caliber or a Miyota 9015 caliber powering the watch. Both solid automatic watch movements, each caliber has its own pros and cons. If you’re unsure which Aquacy watch is right for you, read our handy guide where we compare the ETA 2824-2 vs. Miyota 9015.


The Swiss ETA 2824-2

A highly popular automatic movement, Caliber ETA 2824-2 is often referred to as a workhorse movement given its ubiquity in the mechanical watch space. 

Measuring 25.6 mm in diameter and 4.6 mm in height, the ETA 2824-2 powers center hour, minute, and sweeping seconds hands, along with a date window at 3 o’clock. It operates at 28,800 beats per hour (4 Hz), includes 25 jewels, and provides a 38-hour power reserve. The ETA 2824-2 utilizes a bi-directional rotor to wind up the movement.

There’s also hacking seconds—meaning the seconds hand will come to a complete stop when the winding crown is pulled out—for precise time-setting. Plus, the date is an instantaneous date feature, which means that at midnight the date will “jump” to the next day rather than a slow and gradual roll. The accuracy rating of the ETA 2824-2 is +/-12 seconds per day up to +/- 30 seconds per day.

Due to its Swiss-made pedigree, the ETA 2824-2 movement is more expensive than comparable movements made in other countries. It’s no secret that Switzerland is the nation most associated with fine watchmaking, therefore calibers that originate from Swiss workshops come with a premium.  


The Japanese Miyota 9015

Made in Japan by Citizen, the Miyota 9015 automatic movement offers similar functionality as the ETA 2824-2 but at a lower price point. 

The Miyota 9015 measures 26 mm in diameter but it is slightly slimmer than the ETA at 3.9 mm thick. It includes the center hour, minute, and sweeping seconds hand (also hacking), in addition to a date window. However, the date window is not a quick change one but instead, it gradually turns to the following day. Frequency rate is the same at 28,000 bph, yet it has a higher power reserve of about 42 hours. Unlike the ETA, the Miyota 9015 utilizes a unidirectional rotor to wind up the movement, which some wearers have noted is markedly noisier.

The accuracy rating of the Miyota 9015 movement is +/-10 seconds per day up to +/- 30 seconds per day.

 Miyota 9015 Movement


ETA 2824-2 vs. Miyota 9015 Specifications



ETA 2824-2

Miyota 9015


Hour, minute, sweeping seconds. Date window.

Hour, minute, sweeping seconds. Date window.


4.60 mm

3.90 mm


25.60 mm

26.00 mm








28,800 beats per hour

28,800 beats per hour

Power Reserve

38 hours

42 hours

Hacking Seconds



Date Change



Accuracy Rating

12~30 seconds per day

10~30 seconds per day

Price Point

More expensive

Less expensive

Country of Origin



Production Start




ETA 2824-2 or Miyota 9015. Which is the Better Choice for the Aquacy 1769 Watch?

Thanks to their robustness, reliability, and ease-of-use, the ETA 2824-2 and the Miyota 9015 automatic movements are great choices for sports watches such as the Aquacy 1769.  

Since both movements offer very similar functionality, it really comes down to a matter of the importance of the Swiss origin for you and whether or not that deserves the extra cost to own. And that is why we offer both options within the Aquacy 1769 collection so you can decide which movement is a better fit for your budget and lifestyle. 

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