Sinn Spezialuhren 456 St I

The Sinn 456 St I, reference 456.010, has a 28 mm polished steel case water resistant to 200 metres. The 9 mm thick case incorporates a see-through back. Self-winding calibre SW100 supplies the mechanical timekeeping. Under a sapphire crystal, the black electroplated dial shows central seconds and a date. The hour appliques are attached by hand and carry luminous paint alongside the hour and minute hands. The watch is resistant to low pressure.