CANADA 1955 NATIONAL WILDLIFE WEEK FIRST DAY COVERS, OTTAWA
4c Musk Ox and 5c Whooping Crane blocks x 4 on individual Philatelic Supply Company unaddressed covers each with slogan and OTTAWA, ONTARIO, CANADA circular cancel dated APR 4 1955, the first day of issue. Generally fine. SG478-479; SC352-353
