Period correct (could be from the 1930's-1960's) German Henninger-Bräu Frankfurt 0,5L beer krug. It is in good condition with some flaws in the glaze, just needs a thorough cleaning. Great item for events, much less farby than a modern bottle.
This is a krug, not a stein. Stein is what English speakers and tourists say. In German a stein is a stone, and is not used to describe a beverage container.