Use the HD12-B for single station operation.
The HD12-B's are the same switch as the rest of our single pole switches but with the option of both buttons have black inserts instead of pearl inlays. This gives you the option of an all black single pole push button switch. Push Button Switches were used in a majority of American homes in the first half of the century and have been duplicated. Switches have been developed to work with both existing and new wiring.