Sunray Brushing

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1. Definition

"Sunray Brushing" is the term used by Caroline Sermier to describe an abrasive finish characterized by purely radial lines. See: Sermier, Caroline and Giulio Papi. High-End Horological Finishing and Decoration. (Le Locle, CH: Audemars Piguet, 2006): 102. Much the same text (but a different illustration) also appears in material by Sermier on the "watches-lexic" website, at:

It is curious that Sermier describes this process as achieved by means of a "bell shaped grinding wheel" turned in a direction opposite to that of a rotating part. This is the method employed by Steffen Pahlow to do Snailing.

The watchmaking firm A. Lange & Sohne, located in Glashütte, calls this decoration "Glashütte Solarisation." ( What they illustrate, however, has a bit more curvature than a simple radial pattern.

2. Examples

A mainspring barrel from a Chinese 6497 watch movement (from a Marina Militaire) watch by flickr user GuySie. (The full version of the photograph (click for it) also shows what would appear to be a variation of Côtes de Genève.)

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(Photograph by flickr user GuySie. License: Creative Commons Attribution-ShareAlike 2.0. Location: )

Below is a detail of a Sea Gull (Chinese, I believe) watch showing "sunray" patterns on the winding barrels. The full surface of the movement (click through to see it) also shows Côtes de Genève.)

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(Photograph by flickr usr jwinfred (Jimmy Smith), at License: Creative Commons Attribution-Noncommercial-NoDerivatives. )

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