Canada #320/364 7c Grey Blue - 5c Olive Grey & Vermilion Queen Elizabeth II, Canada Goose & House on Fire, 1952-54 Karsh Issue & 1956 Fire Prevention Week, October 1956 30c Double Airmail to Denmark Franked With 2 Definitives and a Plate Block

A fine 30c double weight airmail cover to Denmark, sent October 1956, and franked with 3c Karsh, 7c Canada Goose and an upper left plate block of the 5c Fire Prevention Issue from 1956.

Unusual because:

• It is a double weight cover.
• The postage has been paid using a commemorative plate block in a non-philatelic way.

Our estimate of the value of this cover based on the above factors is $20. 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.