Sellers generally exaggerate when selling ancient clocks and watches, pushing the manufacturing life of clocks and watches forward. How can we accurately judge the history of watchmaking? As far as ancient clocks and watches are concerned, the date of manufacture should be engraved on the movement in the watch, which is supposed to be the time to judge the clock.

The approximate production age of pocket watches is mostly judged by style, technology, machine structure, pointer, dial design, materials used and winding method. All of the above can provide some "clues". However, the development of pocket watches and watches has different changes in each major period. According to historical records, most women's watches before World War I were worn by ladies as jewelry to show their dignity. You don't pay attention to timing, you only pay attention to the matching of the original strap and jewelry, and you don't pay attention to the quality of each part of the watch core.

When buying old watches and clocks, we can calculate the approximate delivery time according to different figures. Most of these numbers are engraved on the watch core and its parts, and some are engraved on the watch case.

If you buy watches made by famous factories such as Patek Philippe, Rolex, Vacheron Constantin, Audemars Piguet, Cartier, Rome and Rado, most of them are in books. You can check the serial number to show the approximate production year. For Patek Philippe watches before 1925, most numbers begin with 8. For example, the 806434 18K gold 18 stone men's watch and the 8 10628 platinum rectangular men's watch are all produced from 1925 to 1930. By analogy, 850486 Jinqi/KOOC-0/8K men's watch and 85/KOOC-0/267 Fang/KOOC-0/8K rose gold men's watch are all products produced by/KOOC-0/936 to/KOOC-0/940.

However, the serial number of Patek Philippe after 95 is different, and it is a variety produced after 1950. According to a friend, if you buy a P.P. with a serial number before 19, its year should be before 1920.

The serial numbers of different watch factories are different. Some watch factories have small output and their number is small. Some big manufacturers have produced many pocket watches and watches before, and the number is only 90, which only shows that this is the product style of the 1940 s. Some pocket watches are rarely produced, and the serial number will never exceed 6 digits, only less than 6 digits.