Here are 2 Clark's O.N.T. Spool boxes, thread of superior quality.  The 1st box has a very pretty picture of a girl having a tea party with her dolls.  The box does show some wear and there are what appear to be pencil marks on the inside label.  The second box is wood and comes with an insert ot hold the spools of thread and a pin cushion in the center.  The label is in very good condition as is the box with just a small stain on the corner.  Both measure approximately 4-1/2" x 3-1/4" x 2-1/4" high.  Really nice pieces for the sewer.  The thread is not included.