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Creator ArtCraft Remove constraint Creator: ArtCraft Subject Postage stamps Remove constraint Subject: Postage stamps Subject Science on postage stamps Remove constraint Subject: Science on postage stamps Subject Special relativity (Physics) Remove constraint Subject: Special relativity (Physics)

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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.