Piaget 9251 Tonneau Onyx – Slim Sophistication in Gold

Stone dial elegance meets mechanical finesse.

At just 2mm thin, Piaget’s legendary Caliber 9P changed watchmaking forever. It allowed for bolder case designs and the integration of hard stone dials — like the flawless onyx dial showcased here.

This rare 1970s Piaget 9251 comes in an elegant 18k yellow gold case with soft tonneau contours — a unique silhouette that sets it apart from the brand’s classic Ellipse designs. The deep-black dial is uninterrupted by markers, emphasizing the minimalist purity of the piece.

Adding to its originality, this example is still fitted with its original Piaget black leather strap and 18k gold buckle — a rare find in this condition.

Powered by the hand-wound Cal. 9P and professionally serviced, this Piaget wears like sculpture: thin, refined, and quietly luxurious.

- wrist size in our picture is 18cm circumference -

DIAL:

• original never touched Onyx dial in flawless condition
• original hands & crown

STRAP & BUCKLE:

• original Piaget black leather strap fitting up to 20 cm wrist size / 1.5 mm thick
  
• original 18k yellow gold Piaget buckle

CASE:

• great overall condition, showing minor traces of use
• 3-body 18k yellow gold case with screw-down case back
• 26 mm (without crown) / 36 mm (lug-to-lug) / 17 mm (between lugs) / 4.8 mm thick
• year: 1970s
• reference.: 9251
• total weight: 31 g

MOVEMENT:

• Piaget Cal. 9P - manual wind
  
• 17 jewels, 18000 A/h, 52 hours power reserve
• professionally serviced 08/2025
• +4 sec/d / 270°

BOX & PAPERS:

• GOLDAMMER certificate of authenticity & service documentation card
• GOLDAMMER box

GOLDAMMER REFERENCE: #1146