Is the perpetual calendar watch expensive?

Why is the perpetual calendar watch so expensive? A perpetual calendar watch is definitely not an ordinary calendar. Ordinary watches with calendar function need to adjust the date every month. It only has a date dial of 3 1 day, so it cannot automatically identify the month and month, and needs to be adjusted on the last day of each month. However, the programming of gears in perpetual calendar watches is more complicated. The magic of a perpetual calendar watch is that you don't have to adjust the date of the watch for hundreds or even thousands of years. The perpetual calendar watch can automatically identify leap years in normal years, as well as the month, month and February of each year. You don't have to adjust the date for hundreds or thousands of years. This shows why perpetual calendar watches are so expensive.