Reference number 154 0002 in excellent condition These models are very rare original crystal Calibre 1001 Chronometer Automatic Precision Omega Constellation Stainless Steel Beautiful Restored Blue Omega Constellation Dial Size 34mm excluding crown x 40mm top to bottom Thickness 10mm Acrylic crystal Chronometer Precision Movement Keeps Precise Time 20 Jewels This Watch is in excellent condition Comes on a generic luxury leather band with a stainless steel Omega buckle It is Original and will become a perfect vintage collectible treasure