I do not recognize this pattern either. It is obviously pieced, rather than appliqued. To reproduce the pattern, lay a block over a piece of paper on your ironing board, such as freezer paper. Poke through the seam lines with a fine pin. play connect the dots with a pen and cut out your pieces. Remember to add seam allowances.
When you sew, remember that it is essentially a 9 patch. Your 4 corner pieces have inner and outer parts. Of course, the pattern you get will be slightly smaller than the original pattern was, due to shrinkage and quilting reducing the size.
The original quilter was quite skilled to get such even blocks that connect so well. Do let us know if you find out more about the pattern.