German Cross in Silver. Maker 21 (heavy), Dietrich März (!)

Heavy (64,5 g) Tombak based and in a very good, slightly worn condition with some patina.
Marked on the underside of the pin with „21“ for the company of Godet & Co. from Berlin. See Dietrich März, The German Cross in Gold, p.132 – 139. Exactly this cross shown in the book on pages138/139.
An extremely difficult to find variant and rare chance to add a reference award to the collection.