My favorite is still the old 1910 era 2 button switch (with the real "mother of pearl" inset for the "on" button, and solid brass plate, of course.
I recently bought a 1957 Leviton catalog which included mother-of-pearl pushbutton switches. I'd bet these were old stock. I have a 1996 Leviton catalog listing t-slot receptacles, and T-rated switches, and other things they were probably trying to unload.
