Silk First Day Covers produced by Colorano were introduced in 1971 with the America’s Wool issue and finished in 2016 with the Snowflakes issue after Mystic purchased Colorano’s stock in February 2016. Each color illustration is printed on satin-finish fabric, fastened to the cover and surrounded by a luxurious gold embossed border. “Silk” First Day Covers feature regular issue and commemorative stamps. They have no additional information about the stamp subject.
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