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Jaeger-LeCoultre · Master Ultra Thin

Strap for Master Ultra Thin Perpetual Stainless Steel / Black / 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
Lug width21 mm
Case diameter39 mm
ReferenceQ1308470 (aka: 1308470)
FamilyMaster Ultra Thin
MovementJaeger-LeCoultre caliber 868/1 Hours, Minutes, Seconds | Date, Day, Month, Year Indicator, Perpetual Calendar | Moonphase
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

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Straps for the Master Ultra Thin Q1308470 (aka: 1308470)

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The Master Ultra Thin Q1308470 (aka: 1308470), seen from the bench

The Jaeger-LeCoultre Master Ultra Thin Q1308470 is a 39mm stainless steel watch with a white lacquered dial featuring applied metal indices. The ultra-thin case measures just 5.2mm thick and features a satin finish. The automatic Jaeger-LeCoultre caliber 868/1 powers the watch, beating at 28,800 vibrations per hour and includes a perpetual complication displaying date, day, month, year, and moon phase. Water-resistant to 30 meters, this watch features 21mm lugs that require specifically sized replacement straps. The movement showcases the brand's Swiss watchmaking heritage with its reciprocal winding oscillator.

Frequently asked questions

What is the lug width of the Jaeger-LeCoultre Master Ultra Thin Q1308470?

The Jaeger-LeCoultre Master Ultra Thin Q1308470 features a <a href="/pages/termine-glossario/misura-ansa">lug width</a> of 21mm. This specific dimension is determined by the 39mm case proportions and Jaeger-LeCoultre's deliberate design philosophy to maintain visual balance. When purchasing an aftermarket strap, compatibility verification is essential, as the difference between 20mm, 21mm, and 22mm—though minimal—significantly affects proper fit and clasp security.

What is the best strap for the Jaeger-LeCoultre Master Ultra Thin Q1308470?

The ideal strap depends on intended use. For formal contexts, <a href="/pages/termine-glossario/alligatore">alligator</a> is the canonical choice: its natural texture dialogues beautifully with the brushed case. For daily versatility, artisanal calf with <a href="/pages/termine-glossario/concia-vegetale">vegetable tanning</a> offers durability and patina that ages elegantly. <a href="/pages/termine-glossario/shell-cordovan">Shell cordovan</a> represents the premium option, with mirror-like surface and 15–20 year lifespan. All straps must be specifically 21mm to ensure proper proportion with the case.

How do I change the strap on the Jaeger-LeCoultre Master Ultra Thin Q1308470?

Strap replacement on the Q1308470 is accomplished via spring bars (attachment springs) positioned at the case extremities. Use a dedicated strap removal tool or small flat screwdriver to compress the spring inward, liberating the lug from the strap. Gently extract the worn strap, then insert the new 21mm strap by aligning the lug with the spring bar hole. Compress the spring until you hear the securing click. If inexperienced, we recommend the service through an authorised jeweller or Casati Milano.

Can I mount an aftermarket strap on the Jaeger-LeCoultre Master Ultra Thin Q1308470?

Yes, the Q1308470 is fully compatible with 21mm artisanal aftermarket straps. Whether <a href="/pages/termine-glossario/alligatore">alligator</a>, calf, <a href="/pages/termine-glossario/shell-cordovan">shell cordovan</a>, or technical materials, the crucial factor is respecting the 21mm lug width and ensuring lugs are constructed to quality standards comparable to the original. Casati Milano straps are dimensioned precisely for this reference and include an 18-month warranty.

What is the average lifespan of a leather strap for the Jaeger-LeCoultre Master Ultra Thin Q1308470?

Lifespan depends on material and tanning method. A calf strap with <a href="/pages/termine-glossario/concia-vegetale">vegetable tanning</a> typically lasts 4–6 years of regular wear, with patina continuously evolving. <a href="/pages/termine-glossario/shell-cordovan">Shell cordovan</a> offers superior durability, 12–20 years, owing to fibre molecular density. <a href="/pages/termine-glossario/alligatore">Alligator</a> sits at 6–10 years. Variables such as sun exposure, humidity, and usage frequency significantly influence longevity. With careful maintenance and occasional conditioning treatments, strap life extends considerably.

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