The metal from which the case and often also the watch band is made affects both wear and deterioration. The case of the watch is usually made of base or precious metals. Gold, for example, is softer than steel and gets scratched faster, so it's only suitable for elegant watches that aren't usually designed for everyday wear. Stainless steel is the most durable material, which also works well as a band.
1. Over time, clocks begin to show signs of use. The bands are the most exposed during use and also deteriorate first, so they need to be changed periodically. Mechanical damage, which includes normal deterioration, exposure to water, chemicals, cosmetics, and even the sweating of the human body, can accelerate band deteriorating.
2. Watches are not resistant to: mechanical damage (these may cause incorrect or reduced functional or aesthetic usability of the product), contact with chemical or organic substances, strong magnetic field (may cause malfunction or stoppage of the mechanism), temperatures above 50 °C or below -10 °C, as well as rapid temperature changes.
3. Erosion and discoloration of the outer coating of the watch as a result of mechanical damage or factors described above shall not be considered a defect.
4. Explanation of waterproofing levels:
3ATM/30m – The watch is only suitable for accidental and minor contact with water, e.g. rain.
5ATM/50m – The watch is only suitable for accidental contact with water, e.g. rain, hand washing.
10ATM/100m – The watch is suitable for longer contacts with water, e.g. swimming.
20ATM/100m – The watch is suitable for use in water, e.g. also diving.