What's this caseback decoration called?

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Hi. Was just wondering if anyone could help me out. What's this caseback decoration technique called (the small circles), and how is it achieved?

Thanks!

 
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Generally speaking that is "engine turning." Accomplished with a small abrasive disc, wire brush, dowel end with abrasives applied, or other means, one at a time, and usually in an overlapping pattern.

Not only for watchmaking but also aviation, automobiles, home decor, etc.
 
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Perlage or perlée


"Watch components that are given a perlée pattern may include the movement main plate and bridges, the inside of the watch case and the watch-case bottom. The perlée patterned parts of a wrist watch are commonly invisible from the outside except if the watch has a transparent casing or deliberately exposed internal parts.

Further grinding patterns used by watchmakers include the clavus pattern, also known by the French term oeil-de-perdrix (partridge eye)."