Official Name: Hamilton HAMILTON Jazzmaster Thinline Small Second Quartz Watch H384410 Genuine This is a quartz model from Hamilton's slim Thinline series, with a thickness of 7.35mm (official figure), which is now discontinued and out of production. The case size is 40mm. The face has a bright silver sunray finish, and the hands and numerals are a calm gold color. The case is also a matching calm gold color, giving it an overall elegant and chic impression. It can be widely matched with both formal and casual fashion. Battery replacement is required.