Louis Cartier drew this shape in 1917 after the tanks he saw roll across the Western Front, and more than a century later it remains a masterclass in watch design. Loved by everyone from Jackie Kennedy to Andy Warhol, it is quiet old-money shorthand on a wrist. Few designs have stayed this cool for this long.

Presents itself in mint condition with little to no signs of wear. Set against a silvered opaline dial, bold black Roman numerals and a  railway minute track give the face its timeless balance, with Cartier’s secret signature tucked inside the X. Crowned by a beaded crown holding a deep blue synthetic spinel cabochon, the right side gets one perfect drop of color. Framed by two clean vertical brancards, the polished steel case catches light like a mirror and wears impossibly slim at only 6.6 mm thick.

Functions include hours and minutes. Powered by a high-autonomy quartz movement, the piece keeps precise time for about 8 years between battery swaps. Pull the beaded crown on the right side of the case out to the setting position, turn it to reach the correct hour and minute, then push it back flush to the case. Water resistance is rated to 30 meters, so everyday splashes are no worry.

Comes as a full set, double-boxed with warranty card, instruction booklet, and Cartier Care booklet.

Small enough to slip under any cuff, bold enough to carry a room. Made for the collector who has the round sports watches and now wants the one flat rectangle that never had to follow a trend. A watch this easy to gift and this hard to forget rarely sits still for long.