NavList:

Wolfgang Köberer you wrote:  The caption on the Plath ad clearly says it's Wittemann. It is implausibla that Plath who knew their customers/models would say it is Wittemann and the person depicted for real not object. Apart from that Wittemann was the 'navigator' on these flights.

Wolfgang
My reason for saying it's not Witterman is because the photograph doesn't look anything like him.  it does look exactly like Flemming.  We must accept that errors such as these are common.  The author might have been a jobbing writer working on commission, not an airship or sextant expert.  It's even worse on the www today with so much unknowledgeable copy and paste going on.  By putting together four separate examples, I think the photos show that it’s Flemming holding the sextant even though my fourth example identifies the spectacle wearing Witterman correctly in three photographs and misidentifies him in the fourth photograph while it’s right next to the other three.  DaveP

https://www.listal.com/viewimage/6120214 
https://www.astro.com/astro-databank/Flemming,_Hans 
https://www.airships.net/lz127-graf-zeppelin/graf-zeppelin-weltfahrt/  
https://facesofthehindenburg.blogspot.com/2009/05/captain-anton-wittemann.html