[manveruppd]

1950s (probably) wooden construction set, cover shows a boy and a girl around a table gazing at their model Edwardian mansion, slide-open wooden box with no brand name, manufacturer, or any other words on it, except "III 12 14 KI 967/56" on the bottom right and (286) on the top right. (The KI could be a K1 as well)
Any help identifying it appreciated!