Rolex, a silver and enamel watch pendant, early 20th century, of spherical form, applied with mauve

Rolex, a silver and enamel watch pendant, early 20th century, of spherical form, applied with mauve guilloché enamel and fine gold decoration, the circular white dial with black Arabic numerals, watch 2.4cm diameter, manual winding movement, movement and case interior signed Rolex, case additionally numbered 1091795, British hallmark, sponsor's mark W&D, date letter for 1919