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Gardner Holt's ten inch sweep brace with patented chuck. 
 

Holt patent brace
Other side
Head view
Chuck apart
The pad is lignum vitae;
the wrist handle is rosewood:

Model # ?
Patent date, etc. ?
Wrist handle
Model number
Manufacturer's marks
B&D-151
Price: $30.00 plus shipping
  

There is a multitude of pits in the wrought iron parts of this brace, and someone has attempted to adjust the opening of the saw cut so as to make it easier to insert bits, with the resulting crack shown at the center, below: 
 

Crack at end of saw cut
Wrought iron is a fairly tough metal because of the plethora of slag stringers that remain after manufacture, so the frame isn't in any danger. No more adjustments !
 
 
That said, the brace appears to have been carried around a lot, but not really used, as the small pair of notches intended to hold points or bits for making starting holes for auger bits has no discernible wear. I can still see remnants of Holt's patent date (December 14, 1880) so the brace was made during the life of that patent, the last fifth of the 19th century. 
 

U.S. Patent No. 235,532
I have seen a few Spofford braces with similar notches to the ones shown in Figure 1 at left, but none are shown in Spofford's various patents of his clamshell chuck design.