Germany - WWI - Iron Cross First Class - Brass Core - Privately Engraved - .800 Silver Marked

A WWI period German Iron Cross First Class. Convex, 3 piece construction, non magnetic centre. The core appears to be brass. The reverse centre of the cross is marked: 800 for the silver content. The reverse right arm of the cross is engraved: M. H. U. - G. SCH. - B. D. - L. in 4 lines. Pin attachment. 

A rare, privately engraved example.