There are some accidental factors: such as, forgot to go up, after dialing the needle forgot to push the handle head, or in the process of using by accidental vibration to spring hang, or a part stuck will cause shutdown, but then it can be restored to normal in time.
In life, we always regard "retrograde" and "fly back" functions as the same thing. Although the two functions of retrograde and fly back look similar, it is difficult to distinguish them. In fact, the functions and mechanical construction principles of the two are completely different!
There are two kinds of watches, one is quartz watch, the other is mechanical watch. Although the production of mechanical watches is low, but the value is very important, mechanical watches account for 75% of the total value of the watch industry.