SIGNED HARRY WINSTON, PROJECT Z6, NO. 133/300, REF. 400-MMAC44ZK, CASE NO. 048847, CIRCA 2012

The Project Z6 is held in a Zalium case, a material unique to Harry Winston haute horlogerie. The Zalium material, patented by Ronald Winston, had been reserved for use in the aerospace industry and for surgical tools. Zalium is a zirconium-based alloy that is reportedly harder than titanium.