M40 army (Heer) infantry shoulder board for 'Oberfeldwebel'with blue backing

Classic M40 pattern army shoulder board for an 'Oberfeldwebel' of the German infantry. Rayon/silk white piping remains in good condition. Silver tresse machine stitched around the boards for NCO ranks, two starts for the rank of Oberfeldwebel. Interesing to see the blue 'Luftwaffe' cloth backing used.