What mesmerized me with this Wempe Edition is indeed this similar look with the old Observation pocket watch, and I think it is a smart thing Lange inspired themselves from this historical watch.
But, as I said, the 1815 Moonphase remains the absolute priority, for me, among Lange watches.
I have a " schema " in mind that I can't change, now.
Am I narrow minded, or a faithful guy, or both?
Who knows, with a bit of luck...
Best,
Nicolas