Frederique Constant · Horological Smartwatch
Strap for Frederique Constant Horological Smartwatch FC-285S5B6
The Horological Smartwatch Silver Dial / Strap 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









Alligator and crocodile, Blue
Blue Alligator and Rubber Hybrid Strap
€138
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 | 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 Frederique Constant Horological Smartwatch FC-285S5B6
What strap size does the Frederique Constant Horological Smartwatch FC-285S5B6 take?
The Frederique Constant Horological Smartwatch FC-285S5B6 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 Frederique Constant Horological Smartwatch FC-285S5B6 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 Frederique Constant Horological Smartwatch FC-285S5B6?
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 Frederique Constant Horological Smartwatch FC-285S5B6?
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 Smartwatch
More Frederique Constant in 20 mm
- Frederique Constant Classics 301BL3B6BClassics
- Frederique Constant Vintage Rally 301HGRS5B26Vintage Rally
- Frederique Constant Index 303GR5B6BIndex
- Frederique Constant Heart Beat 310MBS5B6Heart Beat
- Frederique Constant Classic Index 310MC5B6Classic Index
- Frederique Constant Manufacture 716GR3H6Manufacture
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
