This button with a diameter of 24.0 mm is in the Assmann & Sohn catalog as article-number 19777 and classified as "Wach-und Schliessgesellschaften" (Private Security Guard Companies). WW2 examples include the inscription "Reichsverband des Deutschen Bewachungsgewerbes e.V." (buttons without the inscription are considered post-war).

This set of 10 "Extra Fein" Buttons appear to be from a double-breasted overcoat. and includes the 10 original 'button keepers' from the coats lining. A nice set for restoring a Uniform Coat.