The early '70s? That's about when I first started collecting. My dad had some Missouri stamps, which I remember thinking looked pretty cool. He was complaining how the cost of postage was skyrocketing from 6c to 8c.
After a while, some glassines were produced w/o postal rates but just had phone numbers and their website address. I have scanned both the front and back on one type. This is one of Canada Post's larger glassines.
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