Jaeger-LeCoultre · Master Control

Strap for Master Control Chronograph Calendar Stainless Steel / Silver / Novonappa

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter40 mm
Reference4138420
FamilyMaster Control
MovementJaeger-LeCoultre caliber 759 Hours, Minutes | Date, Day, Month | Chronograph, Column wheel | Moonphase
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the Master Control 4138420

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Master Control 4138420, seen from the bench

The Master Control represents one of Jaeger-LeCoultre's classic collections, characterized by multiple complications in a traditional design. It houses the Jaeger-LeCoultre 759 caliber with column-wheel chronograph functions, full calendar, and moon phase indication. The reference 4138420 integrates indicators for hours, minutes, date, day, month, and chronograph in a dress watch configuration.

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.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only