Mindener Karosseriefabrik?
Not Freudenau, not MFK and also not Schle, Mann & Co.
For the sake of fairness, for everyone who doesn't know about the historical connection between 'Mindener Fahrzeugfabrik' and 'Clausing':
..in 1948, “Mindener Karosserie und Fahrzeugbau GmbH” was entered into the commercial register as a new company. The abbreviation gave rise to the company logo M I K A F A.
At the end of the 1960s, the MIKAFA company merged with the Minden body construction company Clausing,..
The merged company is still using the "MIKAFA"-name for their new motorhomes..
Also, nothing to add..