Beautiful discontinued pattern duvet cover from The Company Store.  So colorful!  I don't know what the CM logo on some of the squares refers to (probably the artist initials).  There is a lining under the top side.  It has the duvet ties in the corners. 
It has some wash wear, a little pilling on blue side, one button is missing, one has been replaced, and looks like one has been repaired.  Please see all photos.