CAFDC543x4re Unitrade # 543 block of 4. Canada Post Replacement Cover
Unitrade # 543 block of 4. First Day Cover
Centennial Definitive - 7ct Transportation
Canada Post Replacement Cover
Ottawa, 30 June 1971
Chung / Narbonne Specialized Catalogue: R160
Beginning in 1949, first day covers forwarded to the post office in Ottawa which were damaged or lost during processing were replaced with a specially designed cover. Eight different cachet designs are known. The practice continued until 1974.