Sinn Spezialuhren 456 St R

The Sinn 456 St R, reference 456.012, has a polished 28 mm steel case with a see-through back, water resistant to 200 metres. Its blue dial is electroplated and resistant to UV light. A sapphire crystal reveals the central seconds and date display. Hand-fitted hour appliques sit beside luminous hour and minute hands. Automatic winding is provided by calibre ETA 2671, which is shock resistant. The 9 mm thick case is also resistant to low pressure.