Canadian Aeroplane - Allied War Exposition

Front:
ALC POLAND- ee on Pablic CANADIAN AEROPLANE - ALLIED WAR EXPOSITION S.F. JULY 7-21- 1918 PHOTO ADV. Co. S.F

Back:
150 Δ Α Σ ο Α. ΔΑΣΟ 2 STAMP Z NO ( NO A Azo Α Α