1973 6c Progress in Electronics First Day Cover

Price: $9.95

Stock #: 1037360

Type: First Day Cover

Postmark: 1973 JUL-10

Postmark City: New York

Postmark State: NY

Stamp: 6c Marconi Spark Coil and Spark Gap

Size: 3.5" x 6.5" (9 x 16.5 cm)

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Additional Details:

Steamship, Marconi, and Spark-Gap Transmitter

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