"A mechanism and display representing the different phases of the moon. A complete lunation takes 29 days, 12 hours, 44 minutes and 2.8 seconds and is divided into four phases. These are new moon, first quarter, full moon, last quarter." (FHH)
Patek Philippe pocket watch moon phases mechanism.
Blancpain Villeret serpent calendar with moon phases.
Blancpain Villeret moon phases mechanism.