Zenith · El Primero
Strap for El Primero Doublematic
Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
20mm
Lug width20 mm
Case diameter45 mm
Reference03.2400.4046/21.C721
FamilyEl Primero
MovementZenith caliber El Primero 4046 hours, minutes, small seconds, Additional 24 hours Hand (adjustable) | date | Chronograph, column wheel | alarm | power reserve indicator
CaseStainless Steel
Straps for the El Primero 03.2400.4046/21.C721
Selected for the 20 mm lug width · workshop selection
Black Rubberized Alligator Strap with Red Tribal Stitching€185
Matte Dark Gray Alligator Strap€195
Millennium Green Alligator Strap — Minimal Stitching€149
Vintage Brown Calfskin Strap — Natural Patina€98
Hammered Calfskin Strap Light Blue€98
The El Primero 03.2400.4046/21.C721, seen from the bench
The Zenith El Primero Doublematic ref. 03.2400.4046/21.C721 is a 45mm stainless steel chronograph featuring the legendary El Primero 4046 caliber, capable of 36,000 vibrations per hour for 0.1-second chronograph resolution. The watch includes column wheel chronograph, alarm complication with dedicated hammer, 24-hour display, power reserve indicator, and date window. The 20mm lug width ensures stable strap mounting and complements the contemporary sports aesthetic of this technical instrument.
The next step
The right strap isn't chosen. It is built, together.
From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.
Request an appointment →Casati Milano · Via XX Settembre 15, Milan · by appointment only