Milano Straps
← Jaeger-LeCoultre

ITENDEFRES

SearchCart
Menu

Jaeger-LeCoultre · Master Ultra Thin

Strap for Jaeger-LeCoultre Master Ultra Thin 1378420

The Master Ultra Thin Réserve de Marche Stainless Steel / Silver / Alligator takes 21 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

21mm
21 mm strapsAll Jaeger-LeCoultre
Not sure about the right strap, or can't find your watch?Message me on WhatsApp
Lug width21 mm
Case diameter39 mm
Reference1378420 (aka: Q1378420)
FamilyMaster Ultra Thin
MovementJaeger-LeCoultre caliber 938 Hours, Minutes, Small seconds | Date | Power reserve indicator
CaseStainless Steel
Water resistance50 m

Spring bar

Swiss Standard universal spring bars

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

Standard spring bar · length 21 mm · Ø 1.8 mm double flange · industry standard, no brand part number

View →
Master Ultra Thin Réserve de Marche Stainless Steel / Silver / Alligator — watch

Your watch with our straps

Master Ultra Thin 1378420 with Grand Cavalier Leather Strap Orange
Master Ultra Thin 1378420 with Brown Italian Leather Strap
Master Ultra Thin 1378420 with Black Saffiano Strap Ecru Stitching

Calf, Orange

Grand Cavalier Leather Strap Orange

€120

★ 4.9 · 12

See the strapAll 21 mm straps

1 / 43

Real photos of the strap and the case. No generated images.

What I'm asked about the Jaeger-LeCoultre Master Ultra Thin 1378420

What strap size does the Jaeger-LeCoultre Master Ultra Thin 1378420 take?

The Jaeger-LeCoultre Master Ultra Thin 1378420 needs 21 mm between the lugs, usually 18 mm at the buckle. It's the size I've been fitting on it for years.

Can the strap on the Jaeger-LeCoultre Master Ultra Thin 1378420 be changed?

Yes. It has spring bars between the lugs: with the right tool the strap comes off in a minute. If you'd rather not risk a scratch, I do it in the workshop.

Can I put a leather strap on the Jaeger-LeCoultre Master Ultra Thin 1378420?

Yes, in 21 mm leather. On a 39 mm dress watch alligator is the natural choice: thin, elegant, what it was born for.

Which strap do you recommend for the Jaeger-LeCoultre Master Ultra Thin 1378420?

A thin 21 mm alligator. You'll find it ready in the 21 mm collection. If you'd rather have something built on your wrist, the Casati atelier.

For changing the strap

Classic Strap and Bracelet Removal Tooltwo-tip spring bar tool→Milano Straps Premium Swiss Standard Watch Bucklestang buckle, steel or PVD→Leather Conditioner Milano Strapsnourishes and protects the strap→Casati Milano Rectangular Epsom Leather Travel Case — Brownfor the watch and spare straps→

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

The atelier's website: casatimilano.com

Updated on · by Antonio Zichichi