This is a really outstanding set of unissued Elite NCO Pioneer/Combat Engineer Shoulder Boards.
Early boards are the sew-in style. Each board measures 45 mm wide x approx. 120-122 mm long. The tops are fine black doeskin wool, with a gray wool back, and black badge cloth wool for piping. Stiffened with buckram interfacing. Metallic wire Tresse.
I had an identical single board in my collection for several years. It came from a German taylor shop horde and was vetted by several advanced collectors.