IWC · GST Aquatimer
Strap for Aquatimer Chrono-Automatic Stainless Steel / Black / Bracelet
Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
20mm
Lug width20 mm
Case diameter42 mm
ReferenceIW3719-28 (aka: 3719-28, IW371928)
FamilyGST Aquatimer
MovementIWC caliber 79320 hours, minutes, small seconds | date, day | Chronograph
Year2004 - 2009
CaseStainless Steel
Straps for the GST Aquatimer IW3719-28 (aka: 3719-28, IW371928)
Selected for the 20 mm lug width · workshop selection
Green Rubberized Alligator Strap with Ecru Tribal Stitching€149
Millennium Green Alligator Strap€195
Black Rubberized Alligator Strap with Red Tribal Stitching€185
Vintage Olive Green Calf Leather Watch Strap€80
Italian Calfskin Rally Strap in Cognac€110
The GST Aquatimer IW3719-28 (aka: 3719-28, IW371928), seen from the bench
The IWC GST Aquatimer IW3719-28 is a professional diving chronograph from the 1990s featuring a 42 mm stainless steel case and IWC caliber 79320 automatic movement. This model includes hours, minutes, small seconds, date, day of week, and a column-wheel mechanical chronograph with counters at 12 and 6 o'clock positions. Water resistance reaches 300 meters, reflecting its amphibious vocation. The 20 mm lug width maintains visual balance between case mass and strap dynamics.
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