40MM Annual Calendar 5905G-013 (2021) Pre-Owned Patek PhilippeThe Patek Philippe Annual Calendar Flyback Chronograph 5905G 013 is a 42mm complicated watch in solid 18k white gold. It is referred to as the "Tokyo 5905" or the "Blue Gradient 5905G." The 5905G 013 is essentially the "collector's grail" version of the Annual Calendar Chronograph since it was limited to just 400 pieces. The watch combines two of Patek Philippe's signature complications: the patented annual calendar that automatically distinguishes