Hamilton · Chrono-Matic

Strap for Hamilton Chrono-Matic H51606640

The Chrono-Matic 50 Auto Chrono Limited Edition 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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Lug width20 mm
Case diameter49 mm
ReferenceH51606640
FamilyChrono-Matic
MovementHamilton caliber H-31 Hours, Minutes, Small seconds | Date | Chronograph
Year2025
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

Chrono-Matic 50 Auto Chrono Limited Edition Blue — watch

Your watch with our straps

Chrono-Matic H51606640 with Grand Cavalier Leather Strap Orange
Chrono-Matic H51606640 with Vintage Brown Calfskin Strap — Natural Patina
Chrono-Matic H51606640 with Brown Italian Leather Strap

Calf, Orange

Grand Cavalier Leather Strap Orange

€120

★ 4.9 · 12

1 / 106

Real photos of the strap and the case. No generated images.

What I'm asked about the Hamilton Chrono-Matic H51606640

What strap size does the Hamilton Chrono-Matic H51606640 take?

The Hamilton Chrono-Matic H51606640 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 Hamilton Chrono-Matic H51606640 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 Hamilton Chrono-Matic H51606640?

Yes, in 20 mm leather. On a 49 mm chronograph I like box calf: it holds its shape and carries a substantial case.

Which strap do you recommend for the Hamilton Chrono-Matic H51606640?

A 20 mm box calf. You'll find it ready in the 20 mm collection. If you'd rather have something built on your wrist, the Casati atelier.

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