Zenith
Chronomaster Open
Ref. 03.3300.3604/21.C822
The Zenith Chronomaster Open (reference 03.3300.3604/21.C822) is a high-performance chronograph from the El Primero collection, known for its precision and heritage. Introduced in 2022, it features a 39.5mm stainless steel case with an open back, a black sunburst dial, and a chronograph complication with 1/10th-second precision. It is designed for enthusiasts seeking both sporty utility and mechanical sophistication.
crystalSapphire
braceletStainless steel triple folding buckle with black Cordura effect strap
movementZenith El Primero 3604 (automatic, 36,000 vph, 60-hour power reserve, chronograph, column wheel, 35 jewels)
functionsHours, minutes, small seconds, chronograph (1/10th second precision)
lug width45.5 mm
dial colorBlack (sunburst finish)
case diameter39.50 mm
case materialStainless steel
water resistance100 meters (10 ATM)
year2022-2026
A registered Zenith 03.3300.3604/21.C822 carries a permanent RGATT passport: origin, history and owners, verifiable by anyone, and a documented history makes a watch easier to sell.