Canada #C3 6c on 5c Scroll Issue Airmail Used on 1934 Underpaid Airmail Cover to US
A very fine cover sent from Montreal to Philadelphia, PA on April 9, 1934, 83 days before the airmail rate to the US was reduced from 8 cents to 6 cents. A single #C3 is affixed and tied by a Montreal CDS duplex cancel. Curiously the deficiency was never caught, though there are no backstamps to indicate that the cover was delivered. Interesting. Est. $35.