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Canada #371, 372. VF mint Never Hinged matched UL Plate #1, panes of 100 (#371) and 50 (#372) of the 1957 UPU Congress Issue. The 15c value in particular is tough to find in full sheet format, due to the face value being triple the domestic rate at the time. Valued as a matched set of plate blocks and singles, but should be worth more as full sheets. 2024 Unitrade =
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