|Diameter:||27.80 mm (12 ligne)|
|Complications:||2-Button, 8-Column Chronograph, Chronograph, Column Wheel Chronograph, Date, Day, Month, Moon Phase, Quick Date Correction, Quick Month Correction|
|Hands:||12 Hour Chronograph Hand at 6:00, 30 Minute Chronograph Hand at 3:00, Central 60 Second Chronograph Hand, Central Hour Hand, Central Minute Hand, Date Pointer at 12:00, Day Window at 10:30, Month Window at 1:30, Moon Phase Wheel at 12:00, Small Seconds Hand at 9:00|
The “Tri-Compax” version of the Universal Cal. 281 is a hand-winding column wheel chronograph movement with hour and minute registers as well as a full calendar with moon phase. It has a distinctive four-subdial look.
- Month window at 1:30 (advanced by pusher at 10:15)
- Chronograph 30 minute counter at 3:00
- Chronograph 12 hour counter at 6:00
- Small seconds at 9:00
- Day window at 10:30 (not quickset)
- Date pointer at 12:00 (advanced by pusher at 8:00)
- Moon phase disc at 12:00 (advanced by pusher at 9:45)
Many of the Universal Cal. 281 family were produced in different versions: The basic “Uni-Compax” movement features only a 30 or 45 minute chronograph counter and small seconds with two subdials, the “Compax” or “Bi-Compax” version adds a 12 hour counter with three subdials, and the “Tri-Compax” includes a full calendar and moon phase with four subdials. The “Compax” naming scheme is often confused today, with two-subdial versions often called “bi-compax” and three-subdial configurations “tri-compax” even though this is incorrect.