"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: http://www.watches-lexic.ch/pages/eng/tec/fs_exp21.htm
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." ( http://www.alange-soehne.com/cms/en/manufactory/superb-craftsmanship/artistic-decorations.html). What they illustrate, however, has a bit more curvature than a simple radial pattern.
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.)
(Photograph by flickr user GuySie. License: Creative Commons Attribution-ShareAlike 2.0. Location: http://www.flickr.com/photos/guysie/3389999521/ )
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.)
(Photograph by flickr usr jwinfred (Jimmy Smith), at http://www.flickr.com/photos/jimmysmith/6985898845/ License: Creative Commons Attribution-Noncommercial-NoDerivatives. )
The photograph by flickr user GuySie is licensed under the Creative Commons Attribution-ShareAlike 2.0 license.
The photograph by flickr user jwinfred (Jimmy Smith) is licensed under the Creative Commons Attribution-Noncommercial-NoDerivatives 2.0 license. Please note that this license is more restrictive than the license of the rest of this present web page; it forbids commercial use (my own use here is noncommercial) and derivative versions (each use of these images on this site is an exact copy of it as downloaded from flickr).
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