Jaeger-LeCoultre · Master Ultra Thin
Strap for Master Ultra Thin Date Stainless Steel / Silver / Alligator
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 diameter39 mm
ReferenceQ1238421 (aka: 1238421)
FamilyMaster Ultra Thin
MovementJaeger-LeCoultre caliber 899/1 hours, minutes, seconds | date
Year2025
CaseStainless Steel
Straps for the Master Ultra Thin Q1238421 (aka: 1238421)
Selected for the 20 mm lug width · workshop selection
Black Rubberized Alligator Strap with Red Tribal Stitching€185
Matte Dark Gray Alligator Strap€195
Matte Black Alligator Strap — Minimal Stitching€149
Vintage Brown Calfskin Strap — Natural Patina€98
Hammered calfskin strap in cuoio€98
The Master Ultra Thin Q1238421 (aka: 1238421), seen from the bench
The Jaeger-LeCoultre Master Ultra Thin features the caliber 899/1 with hour, minute, second and date indications. The Q1238421 reference presents an essential design focused on the thinness of the case. The automatic movement provides the basic functions with the brand's characteristic ultra-thin construction.
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