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Jaeger-LeCoultre · Master Ultra Thin

Strap for Jaeger-LeCoultre Master Ultra Thin 1278420

The Master Ultra Thin Small Second takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

18mm
18 mm strapsAll Jaeger-LeCoultre
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Lug width18 mm
Case diameter39 mm
Reference1278420 (aka: Q1278420)
FamilyMaster Ultra Thin
MovementJaeger-LeCoultre caliber 896 Hours, Minutes, Small seconds
Year2014
CaseStainless Steel

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 18 mm · Ø 1.8 mm double flange · industry standard, no brand part number

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Master Ultra Thin Small Second — watch

Your watch with our straps

Master Ultra Thin 1278420 with Vintage Brown Calfskin Strap — Natural Patina
Master Ultra Thin 1278420 with Brown Italian Leather Strap
Master Ultra Thin 1278420 with Black Saffiano Strap Ecru Stitching

Calf, Brown

Vintage Brown Calfskin Strap — Natural Patina

€98

★ 4.9 · 11

See the strapAll 18 mm straps

1 / 47

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

What I'm asked about the Jaeger-LeCoultre Master Ultra Thin 1278420

What strap size does the Jaeger-LeCoultre Master Ultra Thin 1278420 take?

The Jaeger-LeCoultre Master Ultra Thin 1278420 needs 18 mm between the lugs, usually 16 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 1278420 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 1278420?

Yes, in 18 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 1278420?

A thin 18 mm alligator. You'll find it ready in the 18 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