IWC · GST Aquatimer

Strap for Aquatimer Chronograph Stainless Steel / Blue / Rubber / Cousteau Divers 2007

Takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

22mm

22 mm straps All IWC

Lug width22 mm

Case diameter44 mm

ReferenceIW3781-01 (aka: 3781-01, IW378101)

FamilyGST Aquatimer

MovementIWC caliber 79320 Hours, Minutes, Small Seconds | Date, Day | Chronograph

CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

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Straps for the GST Aquatimer IW3781-01 (aka: 3781-01, IW378101)

Selected for the 22 mm lug width · workshop selection

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The GST Aquatimer IW3781-01 (aka: 3781-01, IW378101), seen from the bench

The IWC GST Aquatimer IW3781-01 is a 44mm stainless steel chronograph featuring the IWC caliber 79320 movement with column-wheel chronograph, date, and day window. This professional diving instrument combines a patented dual-bezel system for underwater interval measurement with 300-metre water resistance and robust 316L steel construction. The 22mm lug width accommodates the integrated bracelet design characteristic of the GST line, conceived in the 1990s as a specialized tool watch for recreational diving applications.

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.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only