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Brand: | ETA | 
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|---|---|---|---|
| Family: | |||
| Height: | 4.85 mm | ||
| Jewels: | 21 | ||
| Reserve: | 50 hours | ||
| Frequency: | 28,800 A/h | ||
| Winding: | Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding | ||
| Diameter: | 25.60 mm (11.5 ligne) | ||
| Complications: | Date, Hacking Seconds, Power Reserve Indicator, Quick Date Correction, Semi-Instantaneous Date Change | ||
| Hands: | Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00, Power Reserve Pointer at 7:00 | ||
| Distinguishing Technical Characteristics | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
 Central-Rotor Automatic  Clockwise Balance Cock  Etachron Regulator |
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| Production: 2004 – 2021 | |||||||||||
| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
ETA’s 2897 is a modular movement with power reserve indicator and date. It is derived from the similar ETA 2892A2 and is part of the third-generation ETA 2890 family. Cal. 2897 appeared in 2004, alongside ETA 2896, and remained available for sale through 2021. After this, only proprietary versions for Swatch Group companies remained available.
ETA 2897 Applications
Cal. 2897 is extremely rare, due to its higher price tag relative to the similar 2892A2.
- 2005 Eterna KonTiki Diver Concept
- 2005 Maurice Lacroix Pontos Réserve de Marche
- 2006 Ball Trainmaster Power Glow (modified with linear readout)
- 2006 Bell & Ross BR01-97
- 2006 Delma Klondike Rectangular Reserve de Marche
- 2011 Bell & Ross Vintage BR WW1
- 2012 Mido Multifort Power Reserve
- 2016 Doxa SUB4000T Professional
ETA 2890 Family Overview
The ETA 2890 family is a series of slim and robust automatic watch movements produced by ETA. They are generally regarded as superior to the similar ETA 2800 family. Cal. 2890 and its successors is based on the Eterna 1466U, with ball bearings on the rotor and a smaller balance wheel in the modern style. Launched in 1975, the family remains one of the leading watch movements to this day.
The most well-known movement in this series today is Cal. 2892A2, a highly evolved automatic movement with central seconds and a date wheel. Because of its slim dimensions, Cal. 2892A2 is often paired with modules to add world time, power reserve indicator, chronograph, and other complications.
Distinguishing features of the ETA 2890 family include a smaller balance wheel than historic movements, including the ETA 2824 family, and a large rotor hub located with seven visible bearings. The balance is located at 12:00 when viewed from the back with the crown at 9:00, and is located by a clockwise cock with an eccentric screw for regulation.
Most members of the modern 2890 family are available in there finish levels:
- Elaboré – with nickel balance
- Top – with Glucydur balance
- Chronomètre – with Glucydur balance and official chronometer certification
ETA also sells these movements with gold plating, various finishes, and custom rotors.
ETA 2890 Family
Most current ETA 2890 family movements have been updated since the 1990s with improved winding efficiency and an extra jewel in the upper winding bridge. As of 2021, ETA is no longer supplying these movements outside the Swatch Group, with most buyers switching to the clone SW300 family from Sellita. Specifically, Cal. SW300-1 replaces ETA’s 2892A2, Cal. SW330-1 replaces ETA’s GMT 2893-1, and Cal. SW360-1 replaces ETA’s small seconds 2895-2.
| Complications | First Generation 1975-1983 | Second Generation 1983-2000 | Third Generation 1996-2021 |
|---|---|---|---|
| No Date | ETA 2890 (12.5”’) | ||
| Date | ETA 2892 (12.5”’) | ETA 2892-2 | ETA 2892A2 |
| World Time Disc, Date | ETA 2893-1 | ||
| Adjustable 24 Hour Hand, Date | ETA 2893-2 | ||
| World Time Disc, No Date | ETA 2893-3 | ||
| Modular Chronograph, Small Seconds, Date | ETA 2894-2 (12.5”’) ETA 2894S2 (12.5”’) | ||
| Small Seconds, Date | ETA 2895-1 | ETA 2895-2 | |
| Dual Concentric Wheel Date | ETA 2896 | ||
| Power Reserve Indicator, Date | ETA 2897 | ||
| Perpetual Calendar, Moon Phase, No Seconds | ETA 2890-9 | ETA 2890A9 | |
| Perpetual Calendar, Moon Phase, Central Seconds | ETA 2891-9 | ETA 2891A9 |
