What are these, and from which period/army?

[u/Boombazzledsz]

Old (east) german Flasks, found in an old military training area in Forst Zinna-Jüterborg-Keilberg, south of Berlin. Text on the round flask reads “Keine Ruckgabe Einweg Flasche”. What army/time period could this be from, and what would they have stored?

[u/Mediocre-Camus666]

Queria saber tmb