The Patek Philippe 13.5-320 watch movement is a mechanical movement, featuring manual winding and a power reserve of approximately 44 hours. It operates at a frequency of 28,800 vibrations per hour and contains 19 jewels for enhanced precision and durability. The movement includes a central hour, minute, and second hand, along with a date function positioned at the 3 o'clock mark. It is designed to provide accurate timekeeping and reliable performance.