Very rare and early piece of radio history here! Photos 2 and 3 show an ad from a 1929 radio retailing magazine (not included). Unit is untested and will be sold as a displayable collectible. Cosmetic condition shown in photos. Displays well and is guaranteed old/original. 

Interference Eliminator Devices The Dubilier Condenser Corporation, 342 Madison Ave., New York City, announces the introduction of two new interference prevention devices known as the "Disturbo-Ducon" and the "Interference Device No. 2." The Disturbo-Ducon is a filter network of inductance and capacity to be employed in series with the radio receiver and the power supply. In this position, the manufacturer says it eliminates all power-line disturbances entering the receiver by way of the power line, as well as interference picked up by the power line, acting as a miniature aerial. It may also be employed at the source of the disturbance when the appliance or machine is sufficiently powerful to radiate or broadcast its own operation. Interfence device No. 2 is a condenser assembly especially suited for interference elimination in commercial work, such as oil burners, elevators, a.c. and d.c. motors, electric sign flashers, etc. It is especially applicable to moderate power circuits since any number of interference causes may be connected in parallel on the same line and treated with just a single interference device across the common line.

I do my best to write accurate descriptions and mention any damage or other issues, but please use the photos to judge the overall condition for yourself. If you have any questions, feel free to send me a message!
                                            
We ship fast and pack very well! Always happy to combine shipping on multiple orders.