The tallest and shortest man from Infanterie-Regiment von der Goltz (7. Pommersches) Nr.54 (by drakegoodman)
Letter on reverse (below) authored in Kolberg on 1.8.17 by Robert —- from II Ersatz Battl. II Komp. Infantry Regt. 54 Kolberg. Letter addressed to his family in Mülhausen Photogr. Paul Neumann, Kolberg.
A popular tradition amongst the German regiments was to take the tallest and shortest man from the regiment and place them side-by-side for a humorous photograph which was later available for sale in the various little shops that serviced the regiment. Imagine if the army tried that these days.