219 Patek Philippe An outstanding and supremely attractive, Ellipse, automatic wristwatch in yellow gold, with integrated bracelet and electric blue dial, with Extract from the Archives, reference 3634/2.

Estimate: € 15.000 –⁠ 30.000

• Model Ellipse
• Year 1974
• Reference 633364
• Case Material 18K yellow gold
• Case Number 536'644
• Bracelet Material 18K yellow gold Patek Philippe bracelet, approximate length 185mm
• Movement Automatic, cal. 28-255, 36 jewels
• Movement Number 1'285'896
• Dimension 32.5mm width x 37mm length
• Signed Case, dial and movement
• Accessories Accompanied by Patek Philippe Extract from the Archives confirming production of the present timepiece in 1974 and its subsequent sale on August 28th, 1986 and invoice of overhaul.

When it appeared in 1967, the Ellipse quietly proposed a different idea of proportion: a case shaped according to the golden ratio, neither round nor rectangular, but something more subtle, more architectural.
Reference 3634 takes that concept and adds presence. The softly stepped case in 18K yellow gold gives depth to the silhouette, while the integrated bracelet turns the watch into a continuous surface of gold, fluid and deliberate. There are no traditional lugs interrupting the line; instead, the bracelet seems to grow naturally from the case, reinforcing the purity of the design.
This example stands out with its rich blue dial, a tone that shifts gently with the light, offering contrast without ostentation. Applied roman numerals and slender hands maintain balance and restraint, allowing the colour to speak without overwhelming the composition. It is confident, but never loud.
Inside beats the calibre 28-255, the ultra-thin automatic movement developed with Jaeger-LeCoultre and later chosen to power the first Nautilus reference 3700. That shared mechanical lineage gives the 3634 an unexpected connection to one of Patek Philippe’s most celebrated creations, yet here it is expressed in a far more discreet manner.
Preserved in strong overall condition and accompanied by its documentation, this Ellipse embodies a particular moment in Patek Philippe’s history, when geometry, design and mechanical refinement met in perfect proportion.