Canada #320/338 7c Grey Blue - 2c Green Canada Goose & Queen Elizabeth II, 1952-53 Karsh Issue & 1954-62 Wilding Issue 1957 19c Overpaid Airmail Cover to Switzerland With Mixed Wilding-Karsh Franking

A very fine overpaid 15c airmail cover to Switzerland, which has been franked with 19c postage, which consists of a mixture of low value Karsh and Wilding stamps, plus a 7c Canada Goose. This last stamp has been affixed partially on top of the 1c Wilding pair, which suggests that the sender put the pairs on initially and then realized that he or she only had a 7c stamp on hand, and so put it on overpaying the postage. The cover does not appear to be philatelic.

Unusual because:

Our estimate of the value of this cover based on the above factors is $10. To understand how we have assessed the cover and arrived at this estimate and to gain a broader understanding of postal history collecting, I would suggest you read the article linked here. It should clarify the factors that make covers, and this one in particular scarce, and will help you to understand why we have estimated it at this amount.