Top left: 1930s unknown producer, hand-painted on 3mm-plywood.
Top left: Late 1940s Mertens-Kunst, hand-painted on 3mm-plywood.
Bottom left: Early 1970er Mertens-Kunst, screen-printed on 3mm-plywood.
Bottom right: 1980s Mertens-Kunst, screen-printed on 3mm-plywood.

Enter the following in the Ebay.de-search: 1950er Maerchen-Holzbild
(My Ebay.de-shop is called maerchenholzbilder)