Description
This collectible plate block of four 6-cent United States postage stamps was issued to honor progress in electronics, and depicts Marconi’s spark coil and spark gap.
Issue Date: July 10, 1973
First City: New York, NY
Printed By: Bureau of Engraving and Printing
Printing Method: Lithographed, engraved
Perforations: 11
Mint, never hinged condition.
We often have multiple copies of this item in stock; the plate number and/or position may vary.
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