B58-631 LOT OF TWO PATENTED BRACES. Gardiner Holt's 1880 patent with the ball-shaped chuck, marked with patent date, 8" sweep, has a square nut rather than wing nut, rosewood head and grip with some minor chipping. Plus Greenleaf Stackpole's 1867 patent with the rotating collar; the less common and more attractive brass collar version, 10" sweep, cast iron head. Good & better 100-200