Mechanical watch What is a perpetual calendar? My watch has a month and a day. I don't know, do I?

The almanac can identify large months and small months, but it needs to be manually adjusted to March 1 on February 28th or 29th every year. Leap almanac can identify big months and small months, but it can't identify leap years, so it needs to be adjusted on February 29th of every leap year. The highest degree of automation is the perpetual calendar, which can automatically identify flat or leap years, large months and small months without special manual adjustment.

How to distinguish

Usually, the front panel or back cover of a watch will be marked with Shi Ying or Auto, so as to clearly distinguish between a quartz watch and a mechanical watch. Another recognition method is to regard the second hand of a watch as a walking mode. If the second hand jumps every second, then this watch is a quartz watch; On the other hand, if you don't jump, it is a mechanical watch.

If you find that the second hand walks for two or four seconds at a time, this watch is still a quartz watch, but when you find that your second hand walks in this gait, it is warning you to replace the battery. Some quartz watches with better design have this device, which will walk for four or five seconds at a time, and inform you in advance that it is time to change the battery.