# 1685 (1976) Chemistry - Mr. Zip, BK/4, UR, MNH
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US 1976
CHEMISTRY
Honoring Chemists and the Centenary of American Chemical Society.
Water Activated Gum
Scott 1685
Perforated 11
Upper Right Stamp Mr. Zip Block of 4
Water Activated Gum
Scott 1685
Perforated 11
Upper Right Stamp Mr. Zip Block of 4
Mint Never Hinged