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Watch reference and component guides

Explore dials, serial numbers and configurations, and learn how to compare watch details with their production period.

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10 December 2025

Rolex Submariner 5508 Small Crown

The Submariner 5508, also known as the "Small Crown," is one of the most iconic watches in Rolex history. Its production ended around 1962, leaving behind a ser...

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In-depth Guides

07 December 2025

The Swiss organization COSC

What is it? COSC (Contrôle Officiel Suisse des Chronomètres) is a Swiss non-profit organization founded in 1973 that tests Swiss-made chronometers. It was found...

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Beyer Chronometer - A Legacy of Tradition and Craftsmanship

In-depth Guides

28 November 2025

Beyer Chronometer - A Legacy of Tradition and Craftsmanship

Beyer Chronometer, located on Zurich's famous Bahnhofstrasse, is the oldest watch retailer in Switzerland. With a history spanning over 260 years and eight gene...

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The 1970s and Rolex Innovation: The Allure of the “Date” 1513 and 1514

In-depth Guides

26 November 2025

The 1970s and Rolex Innovation: The Allure of the “Date” 1513 and 1514

The 1970s were an exciting time for watchmaking, characterized by ever-evolving trends and a carefree spirit. This period saw Rolex emerge as an innovative lead...

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In-depth Guides

10 November 2025

The Rolex “Roulette” Date: A Style Icon

Rolex's famous "Roulette Date" debuted in 1945 on the first DateJust model. This distinctive style of date display, with alternating red and black numerals, evo...

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Anti-Reflective Coating in Watches: Function and Evolution

In-depth Guides

08 November 2025

Anti-Reflective Coating in Watches: Function and Evolution

Anti-reflective coating (AR) is a thin layer applied to the crystal of a watch to reduce reflections and glare. This feature is essential for improving the read...

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In-depth Guides

05 November 2025

A.P.R.I.O.R. Sigma Dial

"Association for the Industrial Promotion of Gold" (APRIOR), a trade association founded under the aegis of the Federation of the Swiss Watch Industry, had a cl...

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In-depth Guides

03 November 2025

HMSU - Rolex's Best-Kept Secret

Among the most exclusive and secretive editions ever created by Rolex, the Submariner Date HMSU is a true rarity. Produced in a limited edition of just 40 piece...

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In-depth Guides

26 October 2025

The Guilloché dials

One of the most refined and common guilloché patterns is the Clous de Paris, also known as the "nail." According to the Fondation de la Haute Horlogerie, the Cl...

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