Polished surface of battery cover has had some design changes. Now it's covered with Clous de Paris like pattern.
Clous de Paris is a special type of guilloche or embossing, resulting in small square knobs. It is also called Paris hobnail or simply hobnail and is found, for example, with the watch model Audemars Piguet Royal Oak. One of the most famous watches to use Clous de Paris as its signature design element is the Patek Philippe Calatrava.
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