This is an extra nice example of an early bit brace patented and made by Abel Streeter of Shelburn Falls, Mass. The marked patents are January 23, 1855 and March 31, 1857. The first is for the small chuck that consists of an open window that allows the visualization of the seating of a square tapered tang as it is fixed by a small. This patent rates as very rare in Pearson's brace book. The second patent is a design one for details of manufacture. It rates a B in Pearson's rarity list. This brace is very clean, with a cast iron top handle and swollen wrist. It has a sweep of 10 inches ans was part of an extensive brace collection. It belongs in another. Fine.