Tudor T603

The T603 is an automatic movement manufactured by Tudor. It has a diameter of 33.3mm, measures 5.5mm thick, beats at 28,800 vph, and contains 25 jewels. The movement features day and date complications and uses a ball-bearing rotor. Based on the Sellita SW240-1 (itself a clone of the ETA 2834-2), it delivers chronometer-grade timekeeping but without official COSC certification. The T603 powers the 41mm Tudor Royal Day/Date models introduced in 2020.