Tim talks with world renowned Patek Philippe scholar, collector, and dealer John Reardon about Patek Philippe calendar watches. From the era of pocket watches to the present day, this talk covers the evolution of Patek Philippe calendar, annual calendar, and perpetual calendar watches. Highly collectible vintage Patek series including the 1526, the 3448, and 3940 receive in-depth treatments drawn from the combined experience of our two hosts. Modern Patek Philippe calendar watches including the 5050, 5035, 5396, and 5236 are discussed for their landmark innovations and relevance to future collectors. This is the ultimate in-depth dive into Patek Philippe calendar watches.