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# 1537 (1974) UPU - Mr. Zip, Sgl, UR, MNH
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US 1974
UNIVERSAL POSTAL UNION
Artwork showing letter writing.
Water Activated Gum
Scott 1537 (1530-37)
Perforated 11
Upper Right Stamp Mr. Zip Single
Mint Never Hinged
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Back to US Plate Blocks - 1306 to 1622C
