Jaeger-LeCoultre · Master Ultra Thin
Strap for Jaeger-LeCoultre Master Ultra Thin Q1378421
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.
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- Ships in 1–3 working days
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- 12-month warranty on manufacturing defects
- Hand-stitched in Milan
Lug width
Your watch with our straps
Calf, Orange
Grand Cavalier Leather Strap Orange
€120
★ 4.9 · 12
1 / 57
Real photos of the strap and the case. No generated images.
What length do I need?
Measure your wrist with a tailor's tape or a piece of string, comfortably snug.
| Wrist circumference | Length (long side / short side) |
|---|---|
| 15.0–16.4 cm | 120 / 70 mm |
| 16.5–17.8 cm | 125 / 75 mm |
| 17.9–19.0 cm | 130 / 80 mm |
| 19.1–20.3 cm | 135 / 85 mm |
| 20.4–21.6 cm | 140 / 85 mm |
| 21.7–22.9 cm | 145 / 90 mm |
The ready-to-wear strap is 115 × 75 mm. For a smaller or larger wrist I make it in the right length: order your length.
What I'm asked about the Jaeger-LeCoultre Master Ultra Thin Q1378421
What strap size does the Jaeger-LeCoultre Master Ultra Thin Q1378421 take?
The Jaeger-LeCoultre Master Ultra Thin Q1378421 needs 21 mm between the lugs. It's the size I've been fitting on it for years.
Can the strap on the Jaeger-LeCoultre Master Ultra Thin Q1378421 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 Q1378421?
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 Q1378421?
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.
More Master Ultra Thin
- Master Ultra Thin Knife18 mm
- Master Ultra Thin Small Seconds Pink Gold - Diamond / Eggshell / Alligator21 mm
- Master Ultra Thin Small Seconds Pink Gold / Eggshell / Alligator21 mm
- Master Ultra Thin Small Seconds Stainless Steel / Silver / Alligator21 mm
- Master Ultra Thin Date Red Gold - Diamond / Eggshell / Alligator21 mm
- Master Ultra Thin Date Pink Gold - Diamond / Eggshell / Alligator21 mm
- Master Ultra Thin Date Pink Gold / Eggshell / Alligator21 mm
- Master Ultra Thin Date Pink Gold / Eggshell / Alligator21 mm
All Master Ultra Thin → Jaeger-LeCoultre families →
Every Master Ultra Thin reference with its measured lug width, on watchbands.ai →
More Jaeger-LeCoultre in 21 mm
- Master Tourbillon Pink Gold / Diamond / Silver / AlligatorMaster
- Master Tourbillon Dual Time Pink Gold / Silver / AlligatorMaster
- Master Tourbillon White Gold / Diamond / Blue / AlligatorMaster
- Master HometimeMaster
- Master Compressor Dualmatic Stainless SteelMaster Extreme
- Deep Sea ChronographMaster Extreme
For changing the strap
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