If in doubt, you can always have a look at the archive's list of the AGK (Society for the History of Papermodeling, in German "Arbeitskreis zur Geschichte des Kartonmodellbaus"). URL is
Arbeitskreis Geschichte des Kartonmodellbaus (AGK) e.V. - Go to Kartonmodell-Datenbank > Verlage Deutschland (komplett) > Kellogg (Bremen).
BUT: Unfortunately the aforementioned houses are not listed there as yet, there are models of some of the 7 wonders of the antique world (~1980ies) and only one model of the Nuremberg Imperial Castle ("Kaiserburg Nürnberg").
Kind regards,
Papercaptain