Plug in mains powered timer device for controlling a single appliance.
This video shows the timer in detail, including the inner mechanism working.
The box is in reasonable condition with some edge wear, and has a 'Good Housekeeping Institute Guarantee' label on the front, No.2986.
The round plastic cover fits over the timer dial. This has yellowed with age.
The paper label reads 'Important, Read Instructions Carefully and remove this paper label before use'.
Switching is limited to one on/off per day, with the red and black markers at the edge of the dial indicaiting the on/off times.
The markers are adjusted by unscrewing the central silver screw, moving the markers, then tightening the screw to lock them in place.
The exposed screws on the back were originally concealed behind a filler material, this was removed during the video to allow the insides to be examined in detail.
The red lever on the top is to select timed / permanently on.