Antique Push Button Light Switch w/ Deco Plastic Cover Hart & Hegeman

The switch is marked "H&H" 

On the back it's pressed in: "H&H 4175 Pat. Appld For"

On one end it's marked "Und. Lab Insp" and on the other end "10A 125 V  5A 250V" .

The switch measures 2 1/2" X 1 5/8" and is 2 1/4" deep (to the top of the button)

The switch plate cover is plastic and looks to be deco era.  

See pictures. 

Hart & Hegeman Mfg Co was in Hartford CT

This was working when I had it replaced some years ago. The house it came from was built in 1907.  It still switches and I assume it works still, but I'm selling as is. Screws, if supplied are not original.