Antique Vintage Edison Era Copper Marble Knife Pull Switch Electrical Disconnect

Description

Antique Edison Era Copper Marble Knife Switch
This is an early electrical switch; featuring Ebony wooden insulators and support structure, copper knife blades, bronze hardware, marble base.  Connections on the front and back.
Unknown date of origin; the number 84 is on the back of the baseboard.  Suggesting 1884 as a possible date.  The Ebony and marble construction suggests this switch is 19th century.
Likely used as a send/receive switch for early telegraph.
Condition is used.  Switch has been cleaned but all hardware is original (except for the standoffs which are added for ease of display).   See pictures.  Some previous soldering done long ago.  See pictures!!!  One corner of the marble is cracked.  See pictures.
The switch is ready to be used.  The switch is well aligned and functions as original.
Base is 12 in. by 7.5 in.
Please ask any questions.
Will be packed carefully.  Buy with confidence.