IWC · Pilot
Strap for Pilot's Watch Spitfire Chronograph JU-Air
Takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
18mm
Lug width18 mm
Case diameter43 mm
ReferenceIW3878-09 (aka: 3878-09, IW387809)
FamilyPilot
MovementIWC caliber 89365
Hours, Minutes, Small Seconds | Date | Chronograph, Flyback
CaseStainless Steel
The Pilot IW3878-09 (aka: 3878-09, IW387809), seen from the bench
The IWC Pilot's Watch Spitfire Chronograph IW3878-09 is a modern evolution of a 1940s military aviation instrument featuring a 43mm stainless steel case and IWC caliber 89365 movement with flyback chronograph. The black dial displays Arabic numerals and luminescent indices in classic pilot watch style, protected by a unidirectional bezel, screw-down crown, and scratch-resistant sapphire crystal. With an 18mm lug width, this watch requires specifically sized straps to ensure proper fit and prevent gaps at the wrist.
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