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.