From the pictures, it looks like it was just the 9patch on point, surrounded by 4 corner triangles (as opposed to using white setting triangles.)
Basically, a square in a square (the inner square being the 9 patch, which is the same size as the blocks in the quilt).
The key here is that red inner border, which is sized to make the border blocks fit exactly around the whole quilt.
Nicely done.
And in 1935, no less.
Last edited by MTS; 11-14-2012 at 07:49 PM.