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PATEK PHILIPPE | GRAND COMPLICATIONS PERPETUAL CALENDAR 5059P-001, A PLATINUM PERPETUAL CALENDAR WRISTWATCH WITH MOON PHASES, RETROGRADE DATE AND LEAP YEAR INDICATION CIRCA 1999 | Watches Weekly | New York | 2020 | Sotheby's
The Human Calculator on Twitter: "Happy Leap Day! Here is the introduction to The Human Calculator Calendar 2020 Edition. #time #calendar #days #months #years #calendarreform #13monthcalendar #28dayseverymonth #leapday https://t.co/RQ0mj4uuWE" / Twitter
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