This Omega is 39 mm 18K yellow gold case, transparent back set with a yellow gold central Observatory medallion, fluted bezel, domed scratch-resistant sapphire crystal with anti-reflective treatment on both sides, opaline silvery dial with Pie Pan design, caliber 8901 self-winding Co-Axial master chronometer movement with date function, approximately 60 hours of power reserve, brown leather strap. Water resistant to 100 m (330 ft).