How to check one watch and one yard of Gu Zun's watch?

The method of checking one watch and one yard of Gu Zun's watch is as follows:

Some watches have two parallel numbers on the back. * * Line is the code, the second line is the serial number, and the first four digits are the production date. The first two numbers represent the third year, and the fourth letter represents the month (some are English abbreviations). Guzun watch recycling store.

Some watches are not made in China, but assembled by others. The first four digits on the back cover are the country of origin code (e.g. = Made in Japan, = Made in Thailand, = China, etc.). All the codes in the component library), and the last four digits are the factory time. How much is the ancient mechanical watch?