Yardley of London opened up their 620 5th Avenue NYC office in 1933. The label on this box shows that address along the bottom edge.
The crest on the box indicates the 1921 Royal Warrant from Prince of Wales.
Yardley products made after 1949, show the crest of King George VI who issued a subsequent Royal Warrant for soap making.
The production year for this example lies between 1933 and 1949.
