According to the latest edition of Der Zuverlässige (the Alt-Opel-IG magazine) Vogt built around 20 Admiral hatchbacks and around 150 Admiral fastbacks with a bootlid. (I think the second number to be too high, though.) Further more they built 3 Diplomat fastbacks (cf. Reply #12). Going by the puzzle picture some hatchbacks must have been a Kapitän instead of an Admiral.
