Case Material Marking — What This Mark Means
An engraving or stamp indicating the material the watch case is made from, such as stainless steel, titanium, or gold. This marking helps verify authenticity and informs care and maintenance decisions.
What This Usually Means
The case material marking identifies what your watch case is constructed from. Common markings include "ST. STEEL" or "SS" for stainless steel, "Ti" or "TITANIUM" for titanium, and karat stamps like "18K" or "750" for gold. This information affects the watch's weight, durability, hypoallergenic properties, and value.
Where to Find It
Typically found on the case back, often near the perimeter or alongside other technical markings. On precious metal watches, hallmarks may also appear on the lugs or inside the case back.
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Common Variations
Stainless steel appears as "SS," "ST. STEEL," "STAINLESS STEEL," or alloy grades like "316L." Titanium may show as "Ti" or "TITANIUM." Gold watches display karat marks (14K, 18K) or fineness stamps (585, 750). Gold-plated watches often show "GP," "SGP," or micron thickness.
Common Misconceptions
A "STAINLESS STEEL BACK" marking doesn't mean the entire watch is stainless steel; often only the case back is steel while the case may be base metal or plated. Similarly, gold-plated (GP) is very different from solid gold, though markings can be confusingly similar.
What to Do Next
Use the material marking to determine appropriate care. Stainless steel is generally low-maintenance, titanium is lightweight and hypoallergenic, and gold requires careful handling. For precious metals, consider having the markings verified by a jeweler if authenticity is a concern.
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Frequently asked questions
What does 'STAINLESS STEEL BACK' mean?
It means only the case back is stainless steel. The rest of the case may be a different material like base metal or plated alloy.
What does '316L' mean on a watch?
316L is a grade of stainless steel commonly used in quality watches. It's corrosion-resistant and suitable for skin contact.
How can I tell if my watch is solid gold or gold-plated?
Solid gold watches typically show karat stamps (18K, 750). Gold-plated watches usually indicate "GP," "Gold Plated," or a micron rating.
Does titanium scratch easily?
Titanium can show surface scratches more easily than steel but is actually harder and lighter. Scratches are typically superficial.
What does 'ALL SS' or 'ALL STAINLESS STEEL' mean?
This indicates the entire case, including the back and bezel, is made from stainless steel rather than just the back.
Is the material marking always accurate?
On reputable brands, yes. However, counterfeit watches may have misleading material markings, so verification matters for high-value pieces.