Sinn Spezialuhren 556 I Mother-of-pearl W

The Sinn 556 I Mother-of-pearl W, reference 556.0102, has a 38.5 mm steel case water resistant to 200 metres. Sapphire crystal sits above the mother-of-pearl dial with its central seconds display. Luminous indices mark the hours alongside coated hour and minute hands. Satinised case surfaces surround a see-through back within the 11 mm thickness. Winding is automatic in calibre SW200-1. The case combines a screw-down crown with resistance to low pressure.