It fits a 3/4 inch collet pull shaft for 3c collets which is correct for 9 SB. Should also fit a 10K lathe. See photos for size and condition. It has been refinished in early SB gray green paint, bearing is perfect. One photo shows it on my 9 Inch lathe but I can't see how to connect it.
Perhaps an additional linkage part is needed. Again, see photos for specifics, I cannot find any engraved part numbers on it. Lathe and collet drawbar shown in one photo are not included, just to show how it fits. The item "Collet closure assembly for South bend lathe 3c" is in sale since Wednesday, October 13, 2021.
This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Workholding\Chucks\Collet Chucks". The seller is "427m6es" and is located in Spring, Texas. This item can be shipped to United States.