How does a tin hip flask distinguish between old and new?

According to the manufacturing process, materials and historical background.

1. The production process of tin-temperature hip flask is different in different years, which can be judged by appearance, grain and carving.

2. The material of tin hip flask may change with time, such as corrosion and oxidation. You can judge whether the material is old or new by checking its state.

3. Under different historical background, the design and manufacture of Wen Xi hip flask are different. We can infer the old and new by understanding the social background and fashion trends at that time.