Omega 3590.50 Speedmaster 3590 50 359050, stainless steel on a stainless steel Omega bracelet (1479 with 612 endlinks), manual wind movement (caliber 861), 12-hour chronograph, original dial and hands have aged to a beautiful creamy patina, tachymeter bezel, water resistant to 100ft, 48.3 mil serial (1998), diameter: 42mm, thickness: 14mm, Excellent condition.