Collectorium · Postage stamp

Progress in Electronics – De Forest Audions

DESCRIPTION OF THE ITEM United States of America, 1973 Air-to-air feed for the development of electronics with early De Forest Audio vacuum tubes and wires. Catalog identification: Scott C86. Number: 11 cents; colour: red, black and gray. Used, with heavy post-aid disinfecting; the back has not been checked. CATALOGUE IDENTIFICATION AND PROBABLE VARIANT Working identification: Scott C86. Most likely attribution: Scott C86. Confidence: high. Possible alternatives: Check tagging/missing tagging, type of rubber and paper, perforation, booklet/coil/pane format, plate/ZIP/copyright selvage and EFO printed deviations. As a back-of-book edition requires also comparison with the specialized section for purpose, watermark, paper and use.

Category

Postage stamp

Year / period

1973

Country

United States of America

Denomination

11 cents

Material

Paper

Collectorium

№ ST-1182