Jaeger-LeCoultre · Geophysic
Strap for Jaeger-LeCoultre Geophysic 8108420
The Geophysic Universal Time Stainless Steel 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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- 30-day returns
- 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 / 43
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 Geophysic 8108420
What strap size does the Jaeger-LeCoultre Geophysic 8108420 take?
The Jaeger-LeCoultre Geophysic 8108420 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 Geophysic 8108420 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 Geophysic 8108420?
Yes, in 21 mm leather. On a 42 mm case a calf strap works every day; if you want something more, alligator.
Which strap do you recommend for the Jaeger-LeCoultre Geophysic 8108420?
A 21 mm calf strap, for every day. You'll find it ready in the 21 mm collection. If you'd rather have something built on your wrist, the Casati atelier.
More Geophysic
- Geophysic 1958 Pink Gold20 mm
- Geophysic 1958 Platinum20 mm
- Geophysic 1958 Stainless Steel20 mm
- Geophysic True Second Pink Gold20 mm
- Geophysic True Second Stainless Steel / Silver / Bracelet20 mm
- Geophysic True Second Stainless Steel / Silver / Alligator20 mm
- Geophysic True Second Stainless Steel / Blue20 mm
- Geophysic Universal Time Pink Gold20 mm
More Jaeger-LeCoultre in 21 mm
- Master Ultra Thin Small Seconds Pink Gold - Diamond / Eggshell / AlligatorMaster Ultra Thin
- Master Ultra Thin Small Seconds Pink Gold / Eggshell / AlligatorMaster Ultra Thin
- Master Ultra Thin Small Seconds Stainless Steel / Silver / AlligatorMaster Ultra Thin
- Master Ultra Thin Date Red Gold - Diamond / Eggshell / AlligatorMaster Ultra Thin
- Master Ultra Thin Date Pink Gold - Diamond / Eggshell / AlligatorMaster Ultra Thin
- Master Ultra Thin Date Pink Gold / Eggshell / AlligatorMaster Ultra Thin
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
