Atwater Kent Model 10A 4560
Atwater Kent Model 10A 4560 Type 1
Atwater Kent Model 10A 4560 Type 2
Set Number 4560 has black components. The Model 10A 4560 has four controls, while the Model 10B 4560 has five.
It was apparently made in two versions, as is obvious from the wiring on the underside of the breadboard.
Speculation is that it was produced at both the old Stenton Street plant and the new Wissahickon Street factory,
with different designs in use.