Some years ago, one had the good fortune to go aboard the Do 24 ATT in the Philippines. Met Iren Dornier, grandson of the designer, and spoke a little about the project. Was told that the aircraft had come from the Deutches Museum and was originally Spanish so it may have been one of the aircraft seen 'churning up the bay'.
Much of the restoration/rebuild was carried out in the Philippines although, in truth, the fuselage is all that remains of the original; the wings are a new design and of course, it has been re-engined. There are connections with: a charity supporting disadvantaged kids in the PI and with a local airline - SeaAir - which operates more modern Do equipment.