Zenith · Class
Strap for Class Sport El Primero Stainless Steel / Black / Strap
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 diameter40 mm
Reference03.0510.400/24.C492
FamilyClass
MovementZenith caliber El Primero 400 hours, minutes, small seconds | date | Chronograph, column wheel
CaseStainless Steel
Straps for the Class 03.0510.400/24.C492
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 Class 03.0510.400/24.C492, seen from the bench
The Zenith Class 03.0510.400/24.C492 is a stainless steel chronograph featuring the celebrated El Primero 400 caliber, beating at 5Hz with 1/10-second resolution. The 40mm steel case measures 13.7mm thick and pairs with a 20mm lug width, a classic proportion from the 1970s–1990s sports watch era. Water-resistant to 100 meters, this timepiece embodies the structural elegance and mechanical complexity of European sport chronographs.
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