What does it mean that the old pocket watch in Shanghai is marked 17?

This means that there are 17 diamonds in the watch. Diamonds originally referred to diamonds, that is, Jin Gangzuan. Later, people called other hard stones diamonds. There are many pinion gears in the watch. The gear keeps turning, driving the second hand, minute hand and hour hand to move forward accurately. The bearing of the bracket gear must be able to withstand numerous frictions, with small loss and small deformation, so as to ensure the accuracy of the clock.

Today, pocket watches are rarely sold in the market, except those introduced by well-known brand manufacturers, which are regarded as gifts, souvenirs and collectibles. Perhaps the pocket watch has been forgotten by many people, but it is a witness of an era and an artistic process in the development of watches. We may choose a more convenient watch when using it, but it is undeniable that pocket watches have a high collection value.

Extended data:

Pocket watches belong to mechanical watches, so the working principle of mechanical watches is:

Mechanical clocks and watches take clockwork as the power system, and drive the escapement governor to work through a transmission system composed of a group of gears, and then the escapement governor controls the rotation speed of the transmission system in turn.

The transmission system drives the pointer mechanism and simultaneously pushes the escapement mechanism. The speed of the transmission system is controlled by the escapement governor, so the pointer can indicate the time on the dial according to certain rules. The winding pointer system is a mechanism for winding springs or moving pointers. In addition, there are some additional mechanisms that can increase the functions of clocks and watches, such as automatic winding mechanism, calendar (double calendar) mechanism, alarm device, moon phase indication and timing mechanism.