ETA Cal. 2826-2 is an automatic movement with big date at 3:00. It is a new entry in the long-running ETA 2800 family, introduced in 2004 but phased out after 2021 with only proprietary versions for Swatch Group companies remaining. The predecessor Cal. 2826 was produced in extremely limited numbers between 1971 and 1977.

The date wheel is the defining feature of Cal. 2826-2. It uses two overlapping discs, with the lower disc numbered 1-16 and the upper disc 17-31 with an aperture between 31 and 17. This allows a larger than usual date to be shown at 3:00 on the dial. The overlapping disc arrangement differs from the traditional dual-disc big date complication at 6 or 12 in many other watches.