Piaget Altiplano Dress Watch 18K White Gold Ref. 911

An exquisite expression of Piaget’s mastery in ultra-thin watchmaking, the Altiplano Ref. 911 is a rare vintage gem rendered in luminous 18K white gold. With its legendary Piaget Calibre 9P movement—just 2mm thin—the watch embodies the maison’s mid-century dedication to elegance and technical finesse. Its understated proportions, complemented by a refined white dial and original blue sapphire crown, make it an extraordinary dress watch for the discerning collector.

Key Features & Historical Context

Model: Piaget Altiplano Dress Watch
Reference: 911
Case: Solid 18K White Gold, 32mm in diameter, with beautifully preserved lines. At just 5.5mm total thickness, it exemplifies Piaget’s pioneering work in ultra-thin horology.
Dial: Original white dial with applied Roman numerals. A clean and timeless presentation, with a discreet defect/scratch near the 2 o’clock marker—adding honest vintage character.
Crown: Original blue sapphire cabochon crown, correct for the reference and era.
Movement: Manual-winding Piaget Calibre 9P, freshly serviced and offered with one-year warranty. This movement set new standards in 1957, measuring only 2mm thick, and remains a cornerstone of the brand’s identity.
Strap: Handmade Belgian black leather strap, fitted for elegance and comfort.
Buckle: Original Piaget 18K white gold buckle, completing the full-Piaget ensemble.

Strap & Accessories

• Strap: Artisanally crafted black leather strap (handmade in Belgium), supple and luxurious, enhancing the formal tone of the watch.

• Clasp: Matching Piaget-signed 18K white gold buckle, a rare surviving original component.

Condition Overview

This Ref. 911 is presented in good vintage condition, retaining the integrity of its ultra-thin white gold case. The dial remains largely clean, with the noted small defect at 2 o’clock visible only upon close inspection. The original sapphire crown and signed buckle heighten its collectibility. Its recently serviced Calibre 9P ensures reliable function, ready for both daily wear or careful preservation.

Why This Watch Matters

• Ultra-Thin Innovation: The Piaget Calibre 9P revolutionized watchmaking in 1957, enabling elegant cases under 6mm thick. The Ref. 911 showcases this legacy in a wearable and highly collectible format.

• White Gold Rarity: Far less common than yellow gold examples, the white gold case offers a discreet, modern elegance.

• All-Original Components: Original crown, dial, buckle, and movement—all aligned for authenticity.

• True Dress Watch Proportions: At 32mm with a razor-thin profile, this is the definition of understated sophistication.

Final Thoughts

The Piaget Altiplano Ref. 911 in 18K white gold is more than a vintage dress watch—it’s a piece of horological history. As one of the earliest and finest examples of ultra-thin Swiss watchmaking, it embodies both technical innovation and timeless design. Rare to find in white gold, complete with its original sapphire crown and buckle, this watch is a refined treasure for collectors who value purity, elegance, and the enduring spirit of Piaget.