Winding: automatic

Frequency - Variations per hour: 4Hz - 28800 V/h

Power Reserve: 72 hours

Accuracy: -2/+2 seconds / day

Jewels: 44

Anti-shock: Paraflex

Service every 10years

Calibre 4131, Rolex In-house manufacture

Swiss made

Base: 4131

central hr

central min

small sec t 6

Chonograph: central sec counter, 30m counter at 3, 12h counter at 9

Watch brands using this movement: Rolex Daytona

Reliability: Exceptional