Case in steel, cambered ovoid with a delicately fluted case band. Sapphire-crystal case back. Dimensions 32.7 x 27.3mm. Water resistant to 3 bar (30m). Dial in grained natural white mother-of-pearl. Off-centre chapter ring at 6 o’clock with Roman numerals in white natural mother-of-pearl marquetry. Self-winding movement. Cal. 586/1. 38 hours power reserve. In-line Swiss lever escapement. Breguet balance on a silicon spring. Balance frequency 3Hz.