I know this pattern by Twilight Star. It can be found in Judy Mathison's book Mariner's compass Quilts-Setting a new Course.
http://www.amazon.com/Mariners-Compa...d_bxgy_b_img_y
Only the maker of the topper omitted the background piece and appeared to leave a fairly larger opening in the middle for the circle applique. I made a topper using the same pattern. Here is a picture of it before I quilted it.
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