Eta 2804 2 Drawing

ETA Caliber 2804-2

Eta 2804 2 Drawing

Manufacturer ETA
Caliber Number 2804-2
Base Caliber
ETA 2801-2
Movement Type
Mechanical, manual wind
Diameter 25.6mm
Thickness 3.35mm
Power Reserve ~42 hours
Jewels 17
Beats Per Hour
28,800 vph, 4Hz
Hands 1.50mm / .90mm / .25mm
Shock Protection Incabloc Novodiac
Regulator Etachron
Hacking? Yes
Hand-Windable? Yes
Functions Hours, minutes, central sweeping seconds, date at 3:00
Country of Manufacture Switzerland, Swiss made
Known Models
(Please add your watch in the comments below!)

The ETA caliber 2804-2 is a member of ETA’s Mecaline family of mechanical watch movements. It is a manual-wind movement with 3 hands and a date. Swiss made with 17 jewels.

Eta 2804 2 Font And Back

Some of the topics covered in this caliber listing:

ETA 2804-2 VS 2824-2:

The 2804-2 is most well-known for being the manual-wind version of the legendary ETA caliber 2824-2 automatic workhorse movement. The differences and similarities have been compared extensively here.

ETA 2804-2 VS 2801-2:

There is a similar caliber 2801-2 which the 2804-2 is based on. The main difference between these two hand-wound mechanical movements is that the 2804-2 has a calendar complication and the 2801-2 is a basic 3 hand watch without a date.

Clone Movements:

Since the patent giving exclusive rights to ETA for the design of the 2804-2 expired, there are similar movements aka “clones” available that are based on this movement: For example the Sellita caliber SW215-1. Some sites refer to the Sellita 215-1 as improved version of the 2804-2, but this is mostly because of two reasons:

ETA isn’t selling movements anymore.

An available movement is better than an unavailable movement.

The Sellita has two extra jewels.

There are 19 jewels in the Sellita VS 17 in the ETA. However, what folks don’t talk about is that extra jewels don’t always equate to being better, and the two extra jewels in the Sellita aren’t proven to make it a superior movement. Sellita appears to have made it a point to add an extra jewel or two to all of their ETA clone movements, which comes in handy when trying to distinguish the two movements. Something else that isn’t talked about is that while the overall patent protection has expired on many ETA movements, there are certain components or systems within the movements that are still protected.

Replacement Prices:

At the time of this post, ETA movements are unavailable. some watch parts suppliers may still have some new old stock for sale. Prices were found online for around $230.00 USD.

Additional Resources:

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ETA Caliber 2824-2 Watch Movement | Caliber Corner
3 years ago

[…] The 2824 is considered to be a “workhorse” movement by many watch enthusiasts. There is also a manual wind version of this movement, known as caliber 2804-2. […]

2 years ago

My watch is a Hamilton Khaki field watch, reference H694190. Nice watch and good movement. I’ve noticed if I let it wind down and then wind it up again because of not wearing it all the time that it’s very inaccurate for a couple of days but then settles back down to a decent tolerance again. Hamilton’s version of this movement – the H-50 has 80 hour power reserve which is a big improvement on the standard ETA 42 hours.

2 years ago

I also have this movement in a Hamilton Khaki Field Watch and couldn’t ask for much more. When in rotation, I typically wind the watch every day at the same time and don’t really envy the 80 hour PR of the newer “H” movement. I also prefer the smoother 4hz / 28,800vph timing of this older caliber. I don’t typically compare against reference clocks, but the accuracy has been excellent to the point of not noticing much error over several weeks; likely +/- a few seconds per day. Early on, I accidentally magnetized the movement by placement on a magnetic… Read more »

2 years ago

Stowa Marine Klassik 40mm with 2804-2

2 years ago

What is the accuracy spec / range for the 2804-2?

Phil tanner
Phil tanner
1 year ago

Very useful site. I use it a lot

1 year ago

My watch is a STOWA Flieger Klassic Sport Baumuster B 43.00 mm from 2019 and have an ETA CALIBER 2804-2 today they us an Sellita SW215-1 

Miguel Duarte Correia Câmara
Miguel Duarte Correia Câmara
10 months ago

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