I got Flapi from Blanca Celestino, a lady from Donostia/San Sebastián, in the Basque region of Spain. She originally told me that she knew the factory where the Froby and Flapi were made, since a defunct good friend of her was from the makers' family. Finally, she sent me the little treasure: Flapi! Thank you a lot, Blanca!
Blanca especially made a funny box to protect and transport the nose flute:
Flapi exactly follows the design of the ES 1,004,918 U patent, filed Mar. 7, 1988 and registered Oct. 10, 1988. The applicants were Uriarte Urbina and Antonia Maria, inventors, for the account of Papelaria Informal S.A., Donostia-San Sebastián.
Flapi was probably produced before Froby, because its design follows the patent (there is a subtle difference in the height of the "wings" though). However, Flapi and Froby are very close one to the other. The main difference lays in the large "wings" that grew on the sides of Froby's airway, providing its futuristic look. The other difference is that a huge injection point appeared on Froby's mouth shield, whilst Flapi featured 2 small and flat ones under the base of the "wings", plus a central one.
Flapi is a rather compact and functional nose flute, according to the fact that the "elephant ears" wings have been designed in order to provide a good grip. Flapi is a beautiful plastic nose flute, already modern comparing to the Schwan which was a plastic version of the antique tin Nasenflöten, but still "shy" when sit besides the Froby.
The nose shield is a simple concave square with a rectangle hole. It is surprinsingly comfortable and efficient. The "elephant ears" are really ergonomic and provide a good grip for the thumb and the forefinger.
Those technical features are very efficient, as already noticed by Mr. Maikel Mei while trying Piet Visser's Froby. Indeed, the Flapi produces a very powerful sound, a great attack and response. Thanks to the nice ergonomics, there is no air leaking.
The tonality range is mid-bass oriented, and trying to reach very sharp notes entails unpleasant ultra-sharp parasitic whistlings. But in the mediums, Flapi is a very good nose flute.
Here is a sound sample. Notice the problem in the high sharps: