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Backus-made ten inch sweep brace with huge patented chuck and patented ratchet. 
 

Quimby Backus brace
Other side
Head view
Jaws open & closed (composite image)
The pad is lignum vitae, and the wrist handle
is very dark rosewood:

The chuck is designed to grip either square-headed bolts or nuts as well as auger bits:
Wrist handle
Bit socket in chuck
B&D-84
SOLD
  

The huge chuck on this heavy brace was designed (in U.S. Patent No. 216,776, granted June 24, 1879) by Quimby S. Backus as a wrench as well as to hold bits. It opens & closes smoothly in spite of heavy pitting & corrosion of the outer portions of the brace's frame. The ratchet is also a Backus invention (U.S. Patent No. 250,047, granted November 29, 1881) and it, too, functions well, even though it does take two hands to pull the selector outwards before turning to the intended orientation.

The chip seen in one of the overall brace images is the only defect in either of the tropical hardwood handles. There is no crusty red rust, so the brace has a pleasing black patina, albeit with a chip in one of the ratchet selector's detents which doesn't affect the function of the ratchet. The pitting of the wire frame is uniform and not obnoxious to the hands.

Right click and then select view image to see the chosen picture at greater resolution.

U.S. Patent No. 216,776
U.S. Patent No. 250,047