"Mendel Rosenbusch Tales for Jewish Children" is a neglected collection of folk-tales for Jewish children, originally published in Germany in 1929.
Children--and even some adults--in a Jewish settlement in eastern Europe are bedazzled by a village elder whose magical powers show them how to behave. In the story, Mendel Rosenbusch--a kind, elderly gentleman--mysteriously receives a magic coin that allows him to become invisible at will. He uses this power to perform anonymous good deeds for his neighbors.