Swatch · Sistem 51
Strap for Swatch Sistem 51 YIS400
The Sistem Earth takes 20 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
- Worldwide shipping
- 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 / 109
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 | 110 / 70 mm |
| 16.5–17.8 cm | 115 / 75 mm |
| 17.9–19.0 cm | 120 / 80 mm |
| 19.1–20.4 cm | 125 / 80 mm |
| 20.5–21.6 cm | 130 / 85 mm |
| 21.7–22.9 cm | 135 / 85 mm |
| over 22.9 cm | on request |
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 Swatch Sistem 51 YIS400
What strap size does the Swatch Sistem 51 YIS400 take?
The Swatch Sistem 51 YIS400 needs 20 mm between the lugs. It's the size I've been fitting on it for years.
Can the strap on the Swatch Sistem 51 YIS400 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 Swatch Sistem 51 YIS400?
Yes, in 20 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 Swatch Sistem 51 YIS400?
A 20 mm calf strap, for every day. You'll find it ready in the 20 mm collection. If you'd rather have something built on your wrist, the Casati atelier.
More Sistem 51
- Sistem Clouds16 mm
- Sistem Black20 mm
- Sistem Chic20 mm
- Sistem Notte16 mm
- Sistem Schwiiz16 mm
- Sistem Fudge16 mm
- Sistem Gentleman20 mm
- Sistem Green20 mm
All Sistem 51 → Swatch families →
Every Sistem 51 reference with its measured lug width, on watchbands.ai →
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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