United States #1866 37¢ Robert Millikan Plate Block
*Plate number and position may vary from image shown.
1982 37¢ Robert Millikan Plate Block
$7.00
2005 37¢ Robert Penn Warren Self-Adhesive Plate Block
United States #3904 - 37¢ Robert Penn Warren Self-Adhesive Plate Block*Plate number and position may vary from image shown.
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