Brand: Rolex Item name: Oyster Perpetual 31 Watch Green Item name (English): Oyster Perpetual 31 Model #: 277200 Material: SS Case Material: Stainless steel Strap Material: Stainless steel Movement: Automatic winding Weight: 91.3 g Case diameter (H): 31 mm (1.22 in) Case diameter (W): 31 mm (1.22 in) Arm circumference (cm): 17.5 cm (6.89 in) Dial: Green date: January 2024 Accessories: Box details: In-house 3 month Maintenance: Polished Item Description: New in 2020. This is Rolex's own high-precision chronometer certified model. It has cleared the inspection standards twice that of the chronometer, which is known for its strict inspection standards. The specs have been improved while keeping the case size at 31 mm (1.22 in). Equipped with the in-house movement "cal. 2232". Power reserve of 55 hours. Item Condition: Roulett.