This is a zinc Luftwaffe ID-disc (Erkennungsmarke) as intended for a member within the 'FL.H.KDTR.E(V) 258/III' (Fliegerhorst-Kommandantur E (v) 258/III). E stands for 'Einsatzhafen for Kampf-, Sturzkampf- and Zerstörerverbände'. (v) stands for 'verlegbar' (transportable), but without its own organic transport. The disc is in good uncleaned condition. Nice original Luftwaffe ID-disc!