KM 'Blockadebrecher-Kriegsabzeichen'
This is a nice example of the Kriegsmarine 'Blockadebrecher-Kriegsabzeichen' (Blocade Runner Badge). The zinc-type badge is not visible maker marked but can most likely be attributed to the company of 'A. Rettenmaier' from Schwäbisch Gmünd. Nice original example in good used condition!