El Primero Winsor Annual Calendar

• 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

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.