German WWII NSFK Membership Pin Back-This is an NSFK membership pin. It shows the Icarus icon of the NSFK on the front. Above him is the blue script NSFK over his head. Below him is a stem of oak leaves. This has lost the majority of its silver finish, but has a nice tone, and very good detailing. The NSFK, as you know, is the predecessor to the Luftwaffe. This is nicely marked on the reverse for RZM M1/33. The pin setup functions as intended.History: Since the Treaty of Versailles officially forbade Germany from building fighter planes of any sort, the German Air Sports Association used gliders to train men still officially civilians for the future Luftwaffe. This air sports organization officially became the NSFK in 1937.