IWC - a gentleman's Portuguese Perpetual Calendar Double Moon wrist watch. Reference 5021, serial 3085311. Signed automatic calibre 50611. Black dial with Arabic numeral hour markers, subsidiary date, month and day dials to three, six and nine, year aperture between seven and eight, double moon-phase indicator for northern and southern hemispheres to twelve. 18ct gold case with exhibition case back, fitted to an authentic brown alligator strap with an 18ct gold deployant clasp. 44mm. Box and papers.