This is a brand new, OEM CW Milanese/mesh steel bracelet in the 20mm size. It has a flat end so can fit any 20mm CW watch,

Originating in mid-19th century Milan, mesh bracelets deliver a look that perfectly complements our most minimal watches. Every bracelet is made from surgical-grade stainless steel and adds a sleek, contemporary feel to any outfit. Taking the watch on and off is a breeze thanks to the ultra-simple butterfly clasp.

As discussed with MH via email