This 1966 Omega Constellation is solid 18k. yellow gold with a crisply readable observatory logo screw-down case back. The case is a large measuring 35.5mm. and looking larger due to the narrow bezel and all-dial visual. There are some minor case marks acceptable for a watch of this age, but not noticeable with the naked eye. The gold original dial and original hands looks amazing. The caliber 561 fine OMEGA movement was just meticulously serviced, accurate and adjusted to chronometer standards. Try to find another solid gold Constellation at this price!