Germany, NSFK. An Aero-Modelling Achievement Badge Stick Pin

A stick pin constructed of gilt iron, a circular oak leaf wreath, the centre is cut out and bears a downward right-facing plane with a cloud at the bottom, the reverse bears the patent number “261945” and the serial number “414”, attached is a soldered, rifled, vertical pin, measuring 20.93 mm (w) x 54.64 mm (h), very fine.