Canada, Environment series, "broken wire"
Centennial issue, Canada tagging error, position W2AC, meaning instead of two phosphour bars on each side, there is one thick one in the middle of each stamp.
1968 Prominent Americans series, coil strip, transfer on reverse
1970's Canada, Landscape series, 25 cent, 2 pre-printing creases
USA 1970 Christmas issue, missing three perfs along bottom
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