Questions On Turning Thirty-One, part II by KlionskyG

Question 9

In November 2019, an item called 6300A made by Patek Philippe SA sold for 31 million CHF (almost 32 million USD) at a charity auction. The item is reversible, has 20 complications, and allegedly took 10,000 man-hours to produce. What is this item?

a (wrist)watch