Introduced circa 1990, the present Boignoire Bi-Plan sports the same "bathtub” case as the original, with the addition of three hand-finished godrons and two horizontal lugs directly hinged to the clasp. As a result, the watch resembles an aircraft from the early 1900s with two sets of wings stacked above one another, which coincidently (or not), is also known as a biplane! The tactical placement of the horizontal bars perfectly frames the oval case, giving the watch a cool Art Deco appeal. Upon closer inspection, these lugs are not just a design affectation, but are in fact, part of an ingenious mechanism that discreetly tucks the deployant clasp behind the caseback, allowing the strap to snugly hug the contours of the wearer's wrist. An extremely rare design, the Bi-Plan clasp on this Baignoire only reveals itself when opened.

A quintessential Cartier creation, the present white gold timepiece flaunts a classic guilloche dial with an ivory background and contrasting black Roman numerals. Of course, the blued steel hands match the sapphire cabochon that tops the crown. Offered at PHILLIPS for the first time, this example is exceptionally well-preserved and is further accompanied by its original accessories. Designed to turn heads, this quartz-driven Baignoire from the Bi Plan Louis Cartier collection is certainly destined to grace the wrists of connoisseurs seeking a classic yet quirky that outshines the ordinary.