The Cartier brand was founded in 1847 by Louis-Francois Cartier in Paris.  In 1904, his grandson Louis developed the brand's first wristwatch at the request of Brazilian aviator Alberto Santos-Dumont.  The first design consisted of a flat-faced watch with a square bezel and a simple-to-read dial.  The watch was named the Santos and became Cartier's first wristwatch for men.

The Cartier Santos 100 Ref W20073X8 features a
brushed 38.5mm x 51mm stainless steel case with a polished flat bezel with exposed screws and a seven-sided heptagon-shaped crown with a blue spinal crystal cabochon.  The white dial features Roman numerals with an inner minute track and lumed hour and minute sword-shaped hands.  Powered by an ETA 2892-A2 automatic movement, the Santos 100 has a
42-hour power reserve and a 100-meter water resistance rating.

This Cartier Santos 100 Ref W20073X8 includes
the outer and inner boxes, the certificate booklet with serial number certificate, the operating instructions booklet, and the original Cartier black alligator leather strap with Cartier clasp.  There is some minor wear on the case and clasp, which are visible in the photographs.