This is a rare and highly collectible US C128 Harriet Quimby, Pilot 1991 (Air Mail) Sheet "Plate # Block of 4" in Mint Never Hinged/MNH quality. The stamp features an aviation theme with a vibrant multi-color design. It was issued in the United States in 1991 and has a denomination of 50c.

The stamp has not been graded or certified, but it is in excellent condition. This is a great addition to any stamp collection, especially those with a focus on aviation or United States Back of Book Air Mail stamps.

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