#4224 2008 41c American Scientists: Gerty CoriColorano Silk First Day Cover

#4224 2008 41c American Scientists: Gerty Cori

Colorano Silk First Day Cover
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$2.95

"Silk" First Day Covers are produced by Colorano and were introduced in 1971. Each cachet is printed on satin-finish fabric, fastened to the cover, and surrounded by a gold embossed border.

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