Round
Sapphire-crystal
44 mm
30m
10.58 mm
Black, three metalized sapphire-crystal discs, ellipse framing the portion of the sky visible from Geneva
Skeletonized
Black sapphire-crystal disks for sky background and moon phases. Transparent sapphire-crystal disk for sky chart and Milky Way
Date by hand
Self-winding, power reserve Up to 48 hours
240 LU CL C
Date. Hours and minutes of mean solar time. Sky chart, phases and orbit of the Moon. Time of meridian passage of Sirius and of the moon.
Alligator strap with square scales
Shiny black
Fold-over clasp