cal. UN-97, finely pierced and engraved automatic lever movement, 33 jewels • blue, grey and silvered dial, off-center gold disk with division for the 12 signs of the Zodiac, overlapping rings representing the following: equinoctial time, local time, the months, signs of the zodiac, the elevation and azimuth of the sun and the moon on the planisphere, the diurnal and nocturnal hours, the moon phases, the aspect of the sun and the moon in relation to each other, blued steel baton hands • 18k white gold case, 18k yellow gold calibrated bezel with Roman and Arabic numerals, hooded lugs with Ulysse Nardin anchor, sapphire case back secured with 4 screws • case, dial and movement signed • with an 18k yellow gold Ulysse Nardin buckle
diameter 40 mm, thickness 13 mm