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Jumping Hours and 22 Extra Hours: Inside the GMT-Master's Calibre 3285
Watch Movements

Jumping Hours and 22 Extra Hours: Inside the GMT-Master's Calibre 3285

A technical account of the GMT-Master's independently jumping local hour hand, the Parachrom hairspring in calibre 3186, and the C…

Jul 29, 2026 6 min read
The Nautilus, the Aquanaut and a Borrowed Movement: Patek's Steel Sports Watches by the Numbers
Market & Economics

The Nautilus, the Aquanaut and a Borrowed Movement: Patek's Steel Sports Watches by the Numbers

The Nautilus was built on the same Jaeger-LeCoultre 920 base as the Royal Oak. We trace the calibre lineage from the 28-255 to the…

Jul 29, 2026 5 min read
3.05 Millimetres: The Calibre 2121 and What Replaced It in the Royal Oak
Watch Movements

3.05 Millimetres: The Calibre 2121 and What Replaced It in the Royal Oak

The Royal Oak's silhouette was a movement achievement, not a styling one. We examine the 3.05mm calibre 2121, the 70-hour calibre …

Jul 29, 2026 5 min read
Calibre 321, 861 and 3861: The Three Engines of the Omega Speedmaster
Watch Movements

Calibre 321, 861 and 3861: The Three Engines of the Omega Speedmaster

A technical account of the Speedmaster's three movement generations: the Lemania-based column-wheel 321, the volume-built cam-leve…

Jul 29, 2026 6 min read
Three Movements, One Daytona: Valjoux, Zenith and the Calibre 4130 Explained
Watch Movements

Three Movements, One Daytona: Valjoux, Zenith and the Calibre 4130 Explained

The Cosmograph Daytona has run three completely different movement architectures. We examine the Valjoux 72 column wheel, Rolex's …

Jul 29, 2026 6 min read
The Rolex Submariner by Reference: Movements, Market Values and What Actually Drives Price
Buying & Collecting

The Rolex Submariner by Reference: Movements, Market Values and What Actually Drives Price

Which Submariner references hold value and why. We analyse 220 live listings across 20 references, three movement generations, and…

Jul 29, 2026 5 min read
Desder D001: A New Italian Independent Built Around a Triple-Axis Tourbillon
Brands & History

Desder D001: A New Italian Independent Built Around a Triple-Axis Tourbillon

Desder is a new independent watchmaking house based in Modena, Italy. Its debut reference, the D001, fuses a three-aperture rotati…

Jun 8, 2026 10 min read
The Tensator System in Watches: Constant Torque from Seat Belts to the Wrist
Watch Movements

The Tensator System in Watches: Constant Torque from Seat Belts to the Wrist

The Tensator is a flat, pre-stressed spring that delivers near-constant force across its entire travel. Oscillon, the tiny Swiss w…

May 29, 2026 12 min read
The Tourbillon: Origin, Engineering, and the Watches That Define It
Watch Movements

The Tourbillon: Origin, Engineering, and the Watches That Define It

From its 1801 patent to the modern flying, multi-axis and gyroscopic variants, the tourbillon has moved from technical solution to…

May 8, 2026 7 min read
Patek Philippe: 185 Years of Quiet Authority
Brands & History

Patek Philippe: 185 Years of Quiet Authority

Patek Philippe has defined luxury watchmaking for 185 years, blending tradition and innovation with unmatched craftsmanship and ex…

May 4, 2026 3 min read
Dive Watches Decoded: From the Submariner to the Seamaster
Types of Watches

Dive Watches Decoded: From the Submariner to the Seamaster

Explore the intricate world of dive watches, from iconic models like the Rolex Submariner to the Omega Seamaster, and understand t…

May 4, 2026 3 min read
Why Some Watches Appreciate and Most Don't
Market & Economics

Why Some Watches Appreciate and Most Don't

Not all luxury watches appreciate in value. This article examines the key factors that contribute to the increasing worth of certa…

May 4, 2026 3 min read

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