NSFK Sponsoring Member's Badge (Förderer-Abzeichen).

Non-magnetic aloy badge which features a winged Icarus and mobile swastika to its center, with “NSFK” stamped above and an “F” to the center of a spray of oak-leaves stamped below.
The outstretched wings of the central figure extend beyond the confines of the circle. The “F” to its base signifies “Forderer” (Sponsor), indicating that this was given to German nationals who made a monthly contribution to the organization.
The reverse is embossed “Ges. Gesch.”, and a stylized maker’s logo GB (Gustav Brehmer), and patent number: 18837
Button hole type.
Nice example.

Material / type of production: non-magnetic aloy
Height: 22 mm
Width: 26 mm
Weight: 3,01 g