Bonjour Richard,
I believe it's the Nordflug Type F.B.1 School/tourist flying boat, as presented at the Gothenburg International Aero Exhibition in 1923.
If correct, then please declare Open House as I doubt that I can get back on-line 'till tomorrow afternoon.
BTW, regarding your "shadow of doubt" about your Seefalke post, it was justifed! Check out post #4226 on page 212, but don't worry, it's not the first time it's been done and I don't suppose it'll be the last!!
From that, I guess that you may not be aware that
Mel has done us all a great service by maintaining a log of all challenges; it can be found as a "Sticky" on the AH&N main page, under "What Cockpit and What Aerodrome latest Lists"