This photograph is part of a series of marketing images used to demonstrate the small size of Helipot products. The horizontal coil 6 cent postage stamp depicts Franklin Delano Roosevelt. This Prominent Americans Issue stamp was issued, in various formats, between January 1966 and February 1968.
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Armstrong & Hess. “Beckman Model 813 Ladder Network with Franklin Delano Roosevelt Stamp,” 1950–1969. Beckman Historical Collection, Box 85. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/4x51hj38g.
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