Germany, Kriegsmarine. A Minesweeper War Badge, by Schwerin Province of China on a dual convex frame

on a dual convex frame with the three insignia held to it via two rivets each

entitled to the  Fenian Raid 1870 clasp

It would appear that this initial design was taken from a Viennese society or fraternity badge from the early part of the twentieth century

An SS Members Runic Breast Insignia - In silver wire thread

Germany, Kriegsmarine. A Minesweeper War Badge, by Schwerin Province of China on a dual convex frame(Kriegsabzeichen fr Minensuch , U Boot Jagd und Sicherungsverbnde). Constructed of gilded and silvered tombak, the obverse consisting of an oval oak leaf wreath, joined together at the bottom by ribbon, topped by a Kriegsmarine eagle clutching a mobile swastika, surrounding a stylized depiction of a sea mine exploding, the reverse with a block hinge and tapering vertical pinback meeting a flat wire catch, designer marked OTTO PLACZEK, BERLIN and maker