ETA 2892-2

	Brand:	ETA
	Family:	ETA Flatline 2890 Family
	Height:	3.6 mm
	Jewels:	21
	Reserve:	42 hours
	Frequency:	28,800 A/h
	Winding:	Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding
	Diameter:	25.6 mm (11.5 ligne)
© ETA This drawing came from an ETA tech sheet for Cal. 2892-2	Complications:	Date, Hacking Seconds, Hand Winding, Quick Date Correction
	Hands:	Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00

Distinguishing Technical Characteristics
Central-Rotor Automatic Clockwise Balance Cock Balance Balance at 12:00 Central Rotor
Production: 1983 – 2000
1910s	1920s	1930s	1940s	1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s

ETA’s 2892-2 was an ultra-thin automatic watch movement and part of the second generation of the ETA 2890 family. It was introduced in 1983 as an update to the outgoing ETA 2892, and remained in production until 2000. The current ETA 2892A2 is the successor movement.

The short-lived Eterna 1504 and ETA 2892 used a large winding mass to power the strong mainspring needed to operate at 28,800 A/h. But when the diameter of the plate was reduced from 12.5”’ to 11.5”’ (25.6 mm) for this ETA 2892-2, issues arose. The winding mass, combined with inefficiencies in the automatic winding works, caused the ETA 2892-2 and related second-generation movements to disappoint users by not being fully wound throughout the day. This was remedied in the successor ETA 2892A2.

The ETA 2892-2 features a date complication like the predecessor ETA 2892. Since it was easy to omit this display, and the advanced date works did not affect the 3.6 mm height of the movement, no successor to the non-date ETA 2890 was created.

ETA Cal. 2892-2 Ebauches and Variants

movement was used as the basis for a number of modular variants:

• ETA 2890-9 (1990-2000): Perpetual calendar with moon phase
• ETA 2891-9 (1990-2000): Perpetual calendar with moon phase and central seconds
• ETA 2894-2 (1996-present): Chronograph with date and small seconds
• ETA 2894S2: Skeletonized chronograph with small seconds
• ETA 2895-1 (1997-2000): Sate and small seconds

Many manufacturers customized the ETA 2892-2 ebauche. Notable variants on this movement include the IWC 3575, 35780, 35782, 35790, and 37521. Clones of this movement include the Sellita SW300.

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.