Dear Nicolas,
You are right. The description and the pictures have been poor and not correct.
Fortunately this watch have been presented in several articles with much better pictures incl. the soft iron cage, therefore I felt quite comfortable to make a bid.
I have been hunting for a Geophysic since a decade to attach it to my Mark XI collection (IWC and JLC) as civil version of it.
Here is the Geophysic with the military brother from 1953.
Cheers,
Uli