Vintage Rotary Round Switch, Single-Pole, 3-Circuit, Electrolier, Porcelain H&H
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Model: HH-2967
Single-Pole 3-Circuit (Also called Electrolier Switch)
4 Terminals
6 Positions (OFF,ON,OFF,ON,OFF,ON) - See detailed operation below
10A @ 125V
5A @ 250V
Made in USA 
Arrow-Hart & Hegeman Electric Co., Hartford, CT (Founded: 1890) Back in the day, they called electrified chandeliers, Electroliers. Other than for lighting, this switch has many other uses.
For a 3-tiered Electrolier, this switch would provide the following three functions:
Turn tier #1 ON only
Turn tiers #1 & #2 ON only
Turn tiers #1 & #2 & #3 ON onlySingle-Pole 3-Circuit Switch Operation:
Press Black Button: All Circuits Open (OFF)
Press White Button: Only Circuit #1 Closed (ON) 
Press Black Button: All Circuits Open (OFF)
Press White Button: Only Circuits #1 & #2 Closed (ON) 
Press Black Button: All Circuits Open (OFF)
Press White Button: Only Circuit #1 & #2 & #3 Closed (ON) See photos for wiring diagram 
Condition: New Old Stock. The white button has some dark spots that appear to be under the clear coating.
I sell a good number of antique/vintage switches which include Rotary, Snap, Push Button, Tap, Despard Style, Tumbler & Toggle. They come in single-pole, double-pole, 3-way, 4-way, High/Low/Medium & momentary switches. And some unusual switches as well. You can go to My Store
to see what I currently have listed. I also have a backlog of switches I haven't listed yet, so if you need a particular type of switch (brand name, size, etc.) or quantity, please contact me and maybe I have what you need. 
Unique among vintage switch sellers, I thoroughly clean and test all my switches to ensure they are in proper working condition. See last photo for cleaning process.
For more Vintage Switches, go to My EBAY Store
or go to My EBAY sister site Store
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