Platinum and Diamond Cocktail Watch by Tiffany

An early 20^th Century Swiss lever in a fine diamond set platinum cocktail watch by Tiffany.  Oval fifteen jewel nickelled keyless three three quarter plate movement by Longines.  Plain cock with polished steel regulator, compensation balance with blue steel spiral hairspring. Club foot lever escapement. Signed metal dial, Arabic numerals, blue steel hands.  Fine rectangular platinum case set with diamonds, hinged diamond set platinum lugs to attach the black cord strap.  Deployant clasp with safety chain.  Signed brown morocco case with gilt decoration.