Cartier. A fine and rare sterling silver Art Deco pen with watch and concealed dial and original box

Cartier. A fine and rare sterling silver Art Deco pen with watch and concealed dial and original box
Signed Cartier, case no.50, engraved Pat(ent) 1891611, manufactured circa 1920
With rectangular-shaped mechanical movement, 21.3 x 9 mm., 17 jewels, silvered matte dial, Arabic numerals, railway minute divisions, massive sterling silver pen-shaped case, wired tubular case engraved MS with black enamel stripes housing the movement, clip engraved Sheaffer Jr, dial signed Cartier, movement signed Normis Watch Co
10 cm. overall length