IWC Portofino series, model: IW356504, automatic winding, 18K 5N gold, diameter: 40mm, movement: Cal.35111 automatic mechanical, 42-hour power reserve • Function: Hour, minute, second, calendar window at 3 o 'clock • Waterproof: 30-meter daily water resistance The 40mm size is friendly, thin and suitable for wearing on wrists ranging from 15.5 to 17.5cm. There is no pressure at all on the formal cuffs Made of 18K rose gold, it has a warm golden tone, exuding a strong sense of luxury in business Settings. The style is reserved and not ostentatious