The Tiefsee is a diver with a strong minimalist vibe. The case comes at 41.5mm in diameter, 48mm lug-to-lug, and 12.3mm in thickness. The lug width is 22mm which might not be as practical as 20mm, but certainly much better than 21mm (I have this weird pet peeve against 21mm lug widths.) The entire case is made of 316L stainless steel, the crystal is of the sapphire variant with anti-reflective coating, and the bezel is made of ceramic. Inside beats the Miyota 821A automatic movement which runs at 21,600 BPH (3Hz) and offers 42 hours of power reserve.