Canada 1943 WWII REGISTERED ALEUTIAN ISLANDS ALASKA CAPO 51 Earliest Recorded Cover

6c USA airmail postal stationery cover, uprated with 15c Prexie, both tied by CAPO 51 SP 10 43 c.d.s., REGISTERED to Toronto, received on October 4, with multple c.d.s. arrival backstamps, the earliest recorded entire from Canadian troops in the Aleutians, a lovely and desirable cover, and a key item for an exhibit or advanced collection.