Zenith
Chronomaster Sport
Ref. 03.3100.3600/21.M3100
The Zenith Chronomaster Sport (Ref. 03.3100.3600/21.M3100) is a high-performance chronograph featuring the El Primero caliber 3600, known for its 60-hour power reserve and advanced column-wheel chronograph mechanism. Introduced in 2021, it blends sporty design with classic Zenith heritage, including a date function and overlapping chronograph registers. Its design draws inspiration from Rolex’s Daytona but stands out with unique dial features like tri-tone sub-dials and a traditional Zenith date at 4:30.
crystalsapphire
braceletstainless steel with deployment clasp (ZENCLASP folding clasp mentioned in later models, but not confirmed for this reference)
movementEl Primero caliber 3600, automatic, 36,000 vph, 35 jewels, 60-hour power reserve, column-wheel chronograph
functionsdate, chronograph (small seconds, 60-minute counter at 6:00, 60-second counter at 3:00)
lug width47mm
dial colorblack
case diameter41mm
case materialstainless steel
water resistance100 meters
year2021
A registered Zenith 03.3100.3600/21.M3100 carries a permanent RGATT passport: origin, history and owners, verifiable by anyone, and a documented history makes a watch easier to sell.