El Primero Winsor Annual CalendarReference# 03.2072.4054/01.C711
- Case: stainless steel
- Size: 42mm
- Movement: automatic winding manufacture caliber El Primero 4054
- Function: annual calendar, chronograph
- Power Reserve: approximately 50 hours
- Water Resistance: 50m
- Dial: matte white
- Caseback: sapphire crystal
- Strap/Bracelet: alligator leather with protective rubber lining
- Factory Warranty: two years
The El Primero is the first automatic integrated chronograph with column wheel beating at the high frequency (36,000 vph) and capable of measuring to a 10th of a second.
This modern incarnation features an annual calendar function, which requires only one adjustment every year.