I just bought an older home (1959), and it has some odd light switches.
The button is a tap button, and just seems to vary the brightness. The slider seems to turn the lights off and on.
The lights installed when we moved in didn't work, so I replaced them with dimmable LEDs (since I assumed the slider was a dimmer). But it doesn't seem to be a real dimmer.
Has anyone seen these before? and if so, is this the expected behavior?