One of, if not the rarest configuration in vintage Piaget Polo “cuff” ref. 7131 is the white-/yellow gold model nicknamed “zebra” in this case with impressive shiny onyx dial.. less than 15%of Piaget Polo’s models have been produced in that model, even less as large size, square models..don’t even start with onyx dial *condition: the case appears to be rarely or unpolished with sharp edges and only light scratches to it. The clasp closed very tightly and looks well without too many signs of “deskdiving..onyx dial is in perfect condition without patina or cracks