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
Lug width22 mm
Case diameter44 mm
ReferenceIW3781-01 (aka: 3781-01, IW378101)
FamilyGST Aquatimer
MovementIWC caliber 79320 hours, minutes, small seconds | date, day | Chronograph
Year2007 - 2008
CaseStainless Steel
Straps for the GST Aquatimer IW3781-01 (aka: 3781-01, IW378101)
Selected for the 22 mm lug width · workshop selection
Millenium Cognac Alligator Strap€195
Matte Blue Alligator Strap€195
Matte Grey Alligator Strap€195
Novonappa Black Military Style Strap for IWC Pilot€142
Hammered calfskin strap in cuoio€98
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.
Request an appointment →Casati Milano · Via XX Settembre 15, Milan · by appointment only