A gold automatic sweep seconds bracelet watch with date, Omega, 'Constellation Calendar' circa 1960

18k, pink gilt lever movement, 24 jewels, mono-metallic balance, adjusted to 5 positions and temperatures, gilt rotor, pink gilt dial with applied baton numerals, aperture for date, circular case with unusual lugs and screw-down case back embossed with the observatory logo, case, dial and movement signed, with integrated 18k gold Omega bracelet and deployant clasp.