An Omega Speedmaster Cal. 321 'Ultraman', watch. Circa 1968. 42 mm steel case with fix tachymetric bezel with original DON (dot over ninety) aluminium insert. Lemaina 321 coloum wheel chronograph movement - hand wound. Matte black dial with beveled outer, luminous tritium hourmarkers, white hour minutes and subdial hands, iconic orange chronograph seconds hand. Swiss made. With digital extract confirming the watch was shipped to a retailer in Thailand in 1968 with orange chronograph hand.