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Frederique Constant · Index

Strap for Frederique Constant Index FC-303BN5B6B

The Index Automatic Roman Black takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

20mm
20 mm strapsAll Frederique Constant
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Lug width20 mm
Case diameter40 mm
ReferenceFC-303BN5B6B
FamilyIndex
MovementFrederique Constant caliber FC-303 Hours, Minutes, Seconds | Date
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Standard spring bar · length 20 mm · Ø 1.8 mm double flange · industry standard, no brand part number

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Index Automatic Roman Black — watch

Straps for the Index FC-303BN5B6B

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

What I'm asked about the Frederique Constant Index FC-303BN5B6B

What strap size does the Frederique Constant Index FC-303BN5B6B take?

The Frederique Constant Index FC-303BN5B6B 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 Index FC-303BN5B6B 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 Index FC-303BN5B6B?

Yes, in 20 mm leather. On a 40 mm case a calf strap works every day; if you want something more, alligator.

Which strap do you recommend for the Frederique Constant Index FC-303BN5B6B?

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.

For changing the strap

Classic Strap and Bracelet Removal Tooltwo-tip spring bar tool→Milano Straps Premium Swiss Standard Watch Bucklestang buckle, steel or PVD→Leather Conditioner Milano Strapsnourishes and protects the strap→Casati Milano Rectangular Epsom Leather Travel Case — Brownfor the watch and spare straps→

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

Updated on · by Antonio Zichichi