ETA’s 2891-9 is a modular perpetual calendar movement produced from 1990 to 2000. It is based on the ETA 2892-2, part of the second generation of the ETA 2890 family. The replacement, ETA 2891A9, based on the updated ETA 2892A2, was introduced in 1999.
The ETA 2891-9 paired a perpetual calendar and moon phase module with the ETA 2892-2 base. This increased thickness from 3.6 mm to 5.2 mm. Unlike the similar 2890-9, this movement has a central seconds hand.
The perpetual calendar layout is as follows:
- Central hour, minute, and seconds hands
- Day pointer at 3:00 (set by pusher at 1:30)
- Month pointer at 9:00 (set by pusher at 8:00)
- Moon phase wheel at 9:00 (set by pusher at 4:30)
- Year/leap year wheel at 9:00 (set with month pusher)
- Date pointer at 12:00 (set by pusher at 10:30)
Omega’s Cal. 1116 is a refinished variant of the ETA 2891-9.
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 |