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Here's a 1921 Gardner Rodman Heliphone crystal radio. The first wireless receiver marketed by the company that would go on to become Garod, a manufacturing powerhouse, the Heliphone was also the first commercially made "pocket" communications device, pre-dating the iPhone by almost a century.
Measuring just 4 1/2" x 6 1/2" x 1" when folded shut, and weighing less than a pound, it contains everything necessary for primitive radio reception: a tuner, a condenser and a crystal detector.
Condition overall is excellent. The original Heliphone condenser is still in good shape, and the secondary tuning coil still slides easily back and forth over the primary coil. Solid mahogany case is in nice shape, with its original shellac finish intact and only minimal scattered marks consistent with age and authenticity.
No damage anywhere, and all of the small hardware is original to the radio.
The radio works, as you can see in the video, although it can be challenging to find a "hot spot" on the crystal (took me several minutes).
Shipping weight, properly packed, will be about 3 lb.
Operation requires a longwire outdoor antenna (at least 120 feet long and 15 feet above the ground) a good indoor ground connection (not household wiring), and an appropriate output device.
In the video above, the radio is connected to a Magnavox AC-3 amplifier (powered by an ARBEIII), and an S.C. horn speaker. Only the radio is included. The radio will of course work with vintage headphones also
I'm one of ebay's best known, most highly regarded sellers of antique radios, and I specialize in radios from the 1920's. I've been selling and shipping them for more than 25 years. When you purchase an antique radio from me, you'll receive a radio that arrives safely because it's been carefully packed (by me, not by some well-intentioned but nonetheless confounded, doe-eyed teenager working at the UPS store who wouldn't know a radio from a radiator), Sure, you can probably get a lower price from Joe and Janet Barn-Find, but when your "bargain" arrives broken, and without any hint of how you might be able to put it back together, you'll realize that you really do get exactly what you pay for.