Introduced in September of 1923, the Radiodyne (by that name) was perhaps the shortest-lived of the Atwater Kent models. The Western Coil Company of Racine, Wisconsin, was already making a radio named "Radiodyne", so AK was forced to abandon its use, and re-christened the set as the Model 10. Few of the original Radiodyne sets survive.
Note the color of the condensers and the TA unit. This green color, called "gray" in the AK literature, was used on all AK sets up through the first three versions of the Model 10, including the Radiodyne.