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Thumbnail	Catalog Number	Details	Description	Denomination	DateIssued	Perforation	Watermark
	C1	Details	Plane Over Map of Canada	5c	09/21/28	12	Unwmk.
	C1a	Details	Plane Over Map of Canada	5c	09/21/28	Imperf.	Unwmk.
	C2	Details	Mercury and Western Hemisphere	5c	12/04/30	11	Unwmk.
	C3	Details	Plane Over Map of Canada	6c on 5c	02/22/32	12	Unwmk.
	C3a	Details	Plane Over Map of Canada	6c on 5c	02/22/32	12	Unwmk.
	C3b	Details	Plane Over Map of Canada	6c on 5c	02/22/32	12	Unwmk.
	C3c	Details	Plane Over Map of Canada	6c on 5c	02/22/32	12	Unwmk.
	C3d	Details	Plane Over Map of Canada	6c on 5c	02/22/32	12	Unwmk.
	C4	Details	Mercury and Western Hemisphere	6c on 5c	07/12/32	11	Unwmk.
	C5	Details	Daedalus	6c	06/01/35	12	Unwmk.