MB&F · Horological Machines
Strap for MB&F Horological Machines 36.SVL.BU
The Horological Machine N°3 HM3 Frog X Blue takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
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- 12-month warranty on manufacturing defects
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Lug width

Straps for the Horological Machines 36.SVL.BU
Selected for the 20 mm lug width · workshop selection
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 MB&F Horological Machines 36.SVL.BU
What strap size does the MB&F Horological Machines 36.SVL.BU take?
The MB&F Horological Machines 36.SVL.BU needs 20 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 MB&F Horological Machines 36.SVL.BU 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 MB&F Horological Machines 36.SVL.BU?
Yes, in 20 mm leather. On a 47 mm case a calf strap works every day; if you want something more, alligator.
Which strap do you recommend for the MB&F Horological Machines 36.SVL.BU?
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 Horological Machines
- Horological Machine N°1 HM1 RS Red Gold20 mm
- Horological Machine N°1 HM1 Red Gold20 mm
- Horological Machine N°1 HM1 Black20 mm
- Horological Machine N°1 HM1 White Gold
- Horological Machine N°10 HM10 Dark Bulldog Blue
- Horological Machine N°10 HM10 Dark Bulldog Black
- Horological Machine N°10 HM10 Dark Bulldog Red
- Horological Machine N°10 HM10 Bulldog Red Gold / Titanium20 mm
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





