ETA 2893-1

	Brand:	ETA
	Family:	ETA Flatline 2890 Family
	Height:	4.10 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)
© ETA ETA 2893-1	Complications:	Date, Hacking Seconds, Quick Date Correction, Semi-Instantaneous Date Change, World Time
	Hands:	Central Hour Hand, Central Minute Hand, Central Seconds Hand, Central World Time Disc, City Window at 3:00, Date Window at 3:00

Distinguishing Technical Characteristics
Central-Rotor Automatic Clockwise Balance Cock Etachron Regulator Balance Balance at 12:00 Central Rotor
Production: 1992 – Current
1910s	1920s	1930s	1940s	1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s

ETA’s 2893-1 is a modular world time movement with central seconds and date. It is derived from the similar ETA 2892-2 and is part of the second-generation ETA 2890 family. Cal. 2893-1 appeared in 1992 alongside the similar ETA 2893-2 and ETA 2893-3 and remains in production today.

ETA 2893 Movements

ETA released a trio of dual time zone movements in 1992, all known as Cal. 2893. Each movement has a slightly different implementation of a 24 hour second time zone display.

In all three movements, the central 24 hour display is quick-set using the crown in second position and is independent of the central hour hand, which is set using the crown in third position. Adjusting the 24 hour hand or disc does not cause the movement to “hack” or stop, so the timekeeping remains accurate when traveling.

Although common today, an independent hour hand like this was somewhat unusual at the time. Indeed, the popular Rolex GMT-Master II Ref. 16710 had just gained an independently-adjustable 12-hour hand four years earlier.

ETA 2893-1 Applications

Cal. 2893-1 is a fairly rare movement, only found in certain world time models. The distinctive world time disc is sometimes replaced with a simple 24 hour disc, as on the Hamilton Khaki Navy Air Race.

• Anonimo Dino Zei Aeronauta
• Hamilton Khaki Navy Air Race
• Wyler GMT

The IWC 37526 and 30750 are similar to the ETA 2893-1.

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.

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