“Aufnahme im Beobachtungsstand, September 1916″ / 20-round “trench magazine”
Image by drakegoodman
Note on reverse (below) generously translated by xiphophilos.
Unable to leave his post, friends of the fellow manning the trench periscope join him to have a memento photograph taken.
Of note is the 20-round "trench magazine" fitted to the sentry’s Gew 98. This innovation was unsuccessful for a multitude of reasons, including the significant amount of force required to close the bolt over a fully loaded magazine.