CAFDC512re Unitrade # 512. Canada Post Replacement Cover
Unitrade # 512 First Day Cover
Henry Kelsey - Western Explorer
Canada Post Replacement Cover
Ottawa, 15 April 1970
Chung / Narbonne Specialized Catalogue: R143
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.