CL48, Unitrade, Canada, 10c, Commercial Airways cover, Aklavik, N.W.T. - Miami, FLA
Featuring a F-VF, Unitrade CL48, tied with a Miami, FLA CDS dated Apr 2 1931 on the reverse with a Unitrade C1, VF, tied with a Aklavik, N.W.T. CDS dated MAR 14 on the front of a bilingual Air Mail envelope.  Also included is a "Pine to Palm" Essay.  I understand that sometimes these may have been affixed to / or included with the envelope.  This essay is M with about 1/2 original gum.