Fine, astronomic, center-seconds, self-winding, water-resistant, Stainless steel gentleman's wristwatch with hours, minutes, seconds, date, month, times of sunrise and sunset, solar decline and equation of time, with indication of the annual solar ephemerides, shown as a curve in a window whose coordinates are the date and hours.Produced in a limited edition in 1989 to celebrate the 100th anniversary of the Firm.