Omega. A fine, large and rare 18K gold limited edition skeletonized split seconds chronograph keyless lever watch with original box

Omega. A fine, large and rare 18K gold limited edition skeletonized split seconds chronograph keyless lever watch with original box
Signed Omega, Olympic Grand Luxe chronograph model, ref. MG 6715 S, manufactured in 1974
Cal. 1130 S 24''' gilt-finished jewelled lever movement entirely hand-cut, filed, angled and chased by Jules-Henri Meylan, the skeletonized movement with Arabic numerals on outer gilt chapter ring, raised gilt ring calibrated for the seconds and 10ths of a second, two subsidiary dials indicating 30 minutes register and constant seconds, in large circular case with grooved satin-brushed band, anti-reflective optical crystals, the split seconds chronograph functions activated through the large button in the band and through the crown, the hour set to the split second by unscrewing and depressing the button to 1 o'clock, movement numbered
66 mm. diam.