Rare Aero Club of Canada Semi Official Stamp on 1st Flight cover#CLP2, 1918, 25c Black & Red. (Used). The rare Aero Club of Canada 25c Semi Official stamp (with numerals of value) tied to 1st Flight cover addressed to Ottawa with Toronto 1918 Duplex cancel, reverse shows violet Ottawa "Dead Letter Office" and "Returned for Additional Postage" handstamps, requiring the additional 2c Tax stamp (MR4) which was later affixed to the front (The semi Official stamp is creased and the cover has faults) nevertheless a very desirable Airmail & Postal History item. Very Fine. 2008 PF Certificate...
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