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The Project Z series is a line of watches that Harry Winston has been producing since 2004.
It is numbered from Project Z1, and Project Z15 was announced in 2021.
As a feature, Harry Winston's uniquely devised special alloy "Zarium" is used for the case.
Zalium is a special alloy mainly composed of zirconium.
It is an excellent material that has high corrosion resistance and acid resistance, is hypoallergenic, and is lightweight.