SPECIFICATIONS
MovementAutomatic, Swiss-made, 4 Hz (28,800 vph), hacking and hand-winding.
CaliberETA 2824‑2, Sellita SW200‑1
Case size~38.5–38.6 mm in diametermm
Case material316L stainless steel, satin/brushed (“satinized”) finish
Case shapeRound, classic sport/tool watch style
Thickness~11–11.1 mmmm
Lug width20 mm, drilled lugsmm
CrystalFlat sapphire crystal with double-sided anti-reflective coating
Dial colorGlossy black
ComplicationsDate at 3 o’clock
Release yearMid-2000s
Sinn
556i
The Sinn 556i is a 3-hand, date, everyday sport watch with a 38.5–38.6 mm steel case, automatic Swiss movement (ETA 2824‑2 or Sellita SW200‑1), 200 m water resistance, sapphire crystals front and back, and a clean glossy black dial with baton indices and date at 3 o’clock.