Rolex — Oyster Dating, ref. 1501. Stainless steel case / stainless steel, silver dial. Automatic movement. Functions: date. Case dimensions approx. 34.5 mm (1.4 inches) (excluding crown), wrist circumference approx. 18.5 cm (7.3 inches), lug width 19 mm (0.7 inches). Accessories: None. Additional details: Serial number: unknown; Frequency: 19,800; Accuracy: -10 seconds/day (measured value) during horizontal testing.