Possibly worked from an iron-on transfer (or tracing) onto a remnant of off-white cotton satin (maybe sheeting).
Design on front flap with satin stitch along hems - mostly stem stitch with a few rows of whip stitch in another shade. 4 main colours using stranded cotton, 3 strands.
Hand stitched French seam to sides.
Size 15.75” width x 11.5” length (40cm x 29cm)