The producer of F1 wore the gold Pilot's Watch Performance Chronograph 41, Ref. IW388309, at IWC's event around the 2025 Miami Grand Prix.
20 mm
Strap size of the Pilot Chronograph ref. IW388309: 20 mm (two sources agree)Case 42.5 mm
Source: IWC Schaffhausen press release, 2 May 2025