This a a very uncommon version of the OMEGA CONSTELLATION dating to 1966. The uncommon OMEGA reference 167.021 steel case measures 33mm. and only 7.75mm. thin including the correct OMEGA hesalite crystal. The correct OMEGA winding crown is installed. The silver original dial is pristine , having striking black steel tipped markers and all black needle style hands. The caliber 712 automatic chronometer grade movement was cleaned and is accurately running. This is a sleek and hard-to-find vintage OMEGA CONSTELLATION that will attract many eyes with its elegant design.