Section 18: The Mastery of Precious Metal Hallmarks

"A hallmark is more than a stamp; it is a centuries-old pledge of purity and craftsmanship, dating back to 13th-century France."

1. The Evolution of Purity Marks

Historically, French guilds required craftsmen to strike unique marks to take responsibility for the metal's fineness. Today, these marks include the purity (fineness), the assay office, and the country of origin.

2. Gold Hallmarks (18K, 14K, 9K)

• 18K Gold (0.750): The Swiss standard for high-end luxury. Look for the profile of Helvetia (the national personification of Switzerland) or the "750" scale mark.
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• 14K Gold (0.585): Highly popular in the US and Europe for its superior mechanical strength and distinct rose-gold hue.
• 9K Gold (0.375): Rare in high horology but found in specialized British or vintage heritage pieces.
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3. Platinum & Silver Symbols

Platinum (Pt950) is often represented by a Dog's Head or a balance scale symbol. Silver hallmarks have seen the most diverse evolution in animal motifs:

• Sterling Silver (0.925): Represented by the Lion (UK) or a Duck (Switzerland, pre-1995).
• 800 Silver: Often marked with a Goose or Capercaillie.
• St. Bernard Dog: The modern Swiss standard mark since 1995 for all precious metals.

Technical Reference: Aorawa Horology Lab | Source: "The Art of Watches".