Unknown Hindenburg Medal w/Iron Cross

[fackerman64]

I inherited a small treasure trove of medals, documents and photographs after the passing of my grandfather. One of these family heirlooms is an unidentified Hindenburg Medal with ribbon and presentation portrait of Hindenburg. The medal is approximately 1.5 cm in diameter and comes with a bow ribbon (red, white and black). It was awarded to my granduncle Wilhelm Zipp who served with the 3. Garde-Feld-Artl.-Regt. out of Berlin. He served on the Russian Front during WWI and in France during WWII. Can anyone help me identify this medal? Any help would be appreciated. For better images, see my Album (fackerman64).

http://gmic.co.uk/uploads/monthly_02_2009/post-6247-1234806767.jpghttp://gmic.co.uk/uploads/monthly_02_2009/post-6247-1234806792.jpg