DLV/NSFK 'Segelflieger-C-Abzeichen'

DLV (Deutscher Luftsportverband) / NSFK (Nationalsozialistisches Fliegerkorps) related so-called 'Segelflieger-C-Abzeichen' (C-Class Glider Pilots Badge). The cloth badge is showing 3 machine embroidered gulls on a Luftwaffe grey wool base. Nice original badge in mint and unissued condition!