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Creator ArtCraft Remove constraint Creator: ArtCraft Place United States Remove constraint Place: United States Subject Postage stamps Remove constraint Subject: Postage stamps Subject Commemorative postage stamps Remove constraint Subject: Commemorative postage stamps

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    • 1966

    Cachet and stamp depict Albert Einstein. Cachet also depicts Einstein's formula for mass-energy equivalence and is from the Prominent Americans Series. The postmark is from Princeton, New Jersey.