Representing a watchmaking milestone, this circa 1913 ladies?? ??Tortue?? wristwatch by Cartier Paris is composed of platinum 18K gold, and diamonds, with a silk strap. The ??Tortue?? tonneau-shaped? case, with millegrain accents, has an off-white dial with black Roman numeral indicators, Breguet-style blued steel hands, and railroad track chapter ring, framed by a rose-cut diamond-set bezel, lugs and winding stem, and encloses a manual-wind movement signed R.A. and Cartier Paris all completed by a black silk strap and gold deployant clasp. This stylish, early Cartier wristwatch is a visionary jeweled sportswear timepiece designed under the direction of the legendary Louis Cartier, and represents a key innovative moment for wearable, jeweled timekeeping.