Un usual brace

[michigancraig]

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looks to be an early brace. 14 3/4 inch over all long  the only mark I seen so far is the #5 on the chuck
Craig

[amertrac]

are the ridges on the chuck threads? maybe there is another couple of pieces missing.
 if so let me know I have over 50 braces and lots of parts  bob w.

[michigancraig]

hope this shows more detail on the brace chuck, you push in on  the tab and the ferrel will turn and come off as shown in the 2nd pic
craig

[michigancraig]

this brace looks simular to http://www.sydnassloot.com/Brace/Staples.htm but then again different
Craig

[Lewill2]

It looks like it was made for the older tapered square ended bits that have a notch in/on one side of the tapered shank. The paw that is inside the square hole would lock into the notch on the bit. I'm not a brace collector but I don't recall seeing one like this before. Looks like a good one to research.   

[Branson]

It sure looks like the C.E. Staples brace,  and definitely for the tapered square shank.

[michigancraig]

definite for a sq shank with notch bit
craig