Designed 1927.
Brass base, black bakélite and matt yellow glass shades.
Stamped 'PH - 4 PATENTED'.
Literature:
Jørstian Tina, Poul Erik Munk Nielsen, 'Light Years Ahead. The Story of the PH Lamp', Louis Poulsen, p. 147, 200, 216.
Produced by Louis Poulsen.
Ref: 180429