Watches + Dictionary = Watchionary
Le Réveil du Tsar - Breguet,

Guilloché is a decorative technique used in the manufacture of watches and other precision instruments. It involves using a specialised tool, called a rose engine, to create intricate, repeating patterns on the surface of a metal component. The patterns are typically created by cutting a series of fine, parallel lines into the metal, using the rose engine, which can be adjusted to produce a wide range of patterns with varying levels of complexity.

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