The Patek Philippe caliber 105 is a manually wound mechanical movement developed during the mid-20th century. Although not as widely known as some of Patek Philippe’s grand complication calibers, the 105 holds an important place in the brand's legacy as a compact, reliable, and finely crafted movement used primarily in ladies' and smaller-sized wristwatches.
Overview of the Caliber 105
The caliber 105 is a small, hand-wound movement, designed to fit within slender and elegant cases—usually in the 21–22 mm range. The movement was developed with a focus on precision, durability, and miniaturization, fitting Patek Philippe’s highest standards for finishing and performance, even in its smallest creations.
This caliber found its home in high-end ladies' watches and jewelry watches, many of which were made in gold or platinum, often with gem-set bezels and dials. While these timepieces were small in diameter, they showcased the same level of watchmaking sophistication as Patek's larger models.
Technical Characteristics
Though modest in size, the 105 was a fully featured mechanical movement with the hallmarks of fine Swiss craftsmanship. Typical technical specs include:
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Movement type: Manual winding
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Diameter: Approx. 13.5 mm (6 lignes)
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Height: ~2.9 mm
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Frequency: 18,000 vibrations per hour (2.5 Hz)
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Power reserve: Roughly 36–40 hours
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Jewels: 17 (varies slightly by version)
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Finishing: Geneva stripes on bridges, perlage on the base plate, polished screws and beveled edges
Despite its small scale, the movement was often adjusted in multiple positions, offering excellent accuracy for its class. Patek Philippe ensured that even its smallest calibers were regulated and finished to the highest level.
Applications in Patek Philippe Watches
The caliber 105 powered various vintage references during the 1940s through the 1960s. These watches often featured:
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Round or oval cases
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Solid gold construction (yellow, rose, or white gold)
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Minimalist or Art Deco-style dials
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Manual-wind crowns integrated into discreet case designs
Because these timepieces were both technically proficient and aesthetically refined, many are now considered collectible vintage ladies’ watches. Some watches using caliber 105 were custom-made or delivered in small batches, making them even rarer today.
Servicing and Preservation
The small dimensions of the 105 make it more delicate to service than larger movements. Watchmakers require skill and precision tools to disassemble, clean, lubricate, and reassemble the movement correctly. As parts for these older calibers become increasingly rare, experienced vintage specialists or factory-authorized service centers are preferred for maintenance.
When properly serviced, the 105 remains a dependable and accurate movement, even decades after its creation.
Conclusion
The Patek Philippe caliber 105 exemplifies the brand’s commitment to excellence, regardless of size or complication. It played a crucial role in bringing fine mechanical watchmaking to elegant, small-format wristwatches, particularly for women. Though understated compared to larger calibers, the 105’s quality, finishing, and historical relevance make it a valuable part of Patek Philippe’s mechanical heritage. For collectors and connoisseurs, watches powered by this movement represent a discreet yet luxurious piece of horological history.
