Piaget reference 9151 is a compact vintage dress watch in white gold, with the brand's slim bracelet-watch style in a restrained, jewelry-like form. The 23 by 28 mm case is paired with an integrated white gold bracelet, and the blue dial with diamond markers at 12, 3, 6, and 9 keeps the design crisp rather than ornate. Its manual movement fits the watch's thin, understated build. At 5 mm thick, it has the quiet, formal presence collectors look for in period Piaget. This piece is sized to fit a 6.5-6.75 inch wrist.