#1501 1973 8c Progress in Electronics: Transistors and Printed Circuit
Colorano Silk First Day Cover
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Silk First Day Covers were produced by Colorano starting in 1971 with the America's Wool issue and ended in 2016 with the Snowflakes issue. Each color illustration is printed on satin-finish fabric, attached to the cover and surrounded by a gold embossed border. Mystic purchased Colorano's FDC inventory in February 2016.
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