|Winding:||Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding|
|Complications:||Date, Day, Hacking Seconds, Leap Year, Month, Moon Phase, Quick Date Correction, Quick Day Correction, Quick Month Correction, Year|
|Hands:||Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Pointer at 12:00, Day Pointer at 3:00, Month Pointer at 9:00, Moon Phase Wheel at 9:00, Year Wheel at 9:00|
|Distinguishing Technical Characteristics|
Clockwise Balance Cock
|Production: 1990 – 2000|
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 since 1975. They are generally regarded as superior to the similar ETA 2800 family. Cal. 2890 and its successors is based on an Eterna design, with ball bearings on the rotor and a smaller balance wheel in the modern style. 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.