The Natural History Teaching Aids, a collection of Schule am meer, was presented by Hafner around 1934/1935 and was a small museum on the island of Juist with his exhibits on display.
Hafners' approximately 1,000 images (watercolors, drawings, oil paintings and sketches) are partly privately owned; The vast majority, however, are at the Küstenmuseum in Juist [REF].