To identify the authenticity of this brand of hot water bottle, you need to pay attention to the screw mouth, brand logo, and smell.

1. Look at the spiral buckles: The spiral buckles of the old-fashioned Yongzi brand hot water bottles are made of metal and plastic, which are fake. Newer products have replaced them with rubber buckles.

2. Brand logo: The real Shanghai Yongzi brand hot water bottle should have a clear brand logo, including the words Shanghai Yongzi brand and the corresponding trademark.

3. Smell: Yongzi brand hot water bottles are made of relatively good materials, so even new products will not have a strong rubber smell. If you find that the smell is too pungent or strong, it is Fake.