Focus on the movement type, as it determines the watch's value and longevity; Japanese (Miyota/Seiko) or Swiss movements are preferred for reliability. Ensure the water resistance rating (e.g., 3ATM, 5ATM, or 10ATM) is clearly defined and tested. For materials, 316L stainless steel is the industry standard for corrosion resistance, while Sapphire crystal offers superior scratch resistance compared to mineral glass. Additionally, verify the battery life for quartz models, aiming for a minimum of 2-3 years.