Marconi Crystal Receiver A Type RB3, by Marconi Company, England, 1922
Inventory Number: 93260
Maker Details: Signed by Marconi's Wireless Telegraph Co. Ltd.
Inscription: "MARCONIPHONE / MWT CO. LTD. [LOGO]" transfers on exterior surface of lid. See Documents for other inscriptions.
Size: 290 x 155 x 120 mm (case)
Other Given Number(s): Christie's 82, eD 58 (orange tag).
Marconi Crystal Receiver A Type RB3, in crinkle-black finish case. Receiver has ebonite surface with dual headphones plugs, crystal and aerial switches, alternative galena and carborundum crystals, crystal battery, aerial and earth terminals. With detachable range block (300 - 450 M), and printed operation instructions insert in the lid.