Wehrmacht (Luftwaffe) 'Kragenbinde' or inner-collar. All uniform jackets and/or tunics needed such a collar, that could be easily removed and washed if needed. The small button is missing, this can easily be replaced. The inner-collar is not visible maker marked or dated. The collar is nicely named to 'Uffz. Richter' (Unteroffizier). Nice original example in good used condition!