Here is a video in which a tin plate nose flute is used as bird call, its original destination. The flute is coarsely made, but really looks like the pio de nariz #25 (the metal one) made by the brasilian Maurilio Coelho.
The Maurilio Coelho's bird call #25 is based on the German "Swan logo" shape :
Here is the #25 sound sample from Coelho's site, which is the soundtrack that was used for the first video :
And here is a video by LePetitJamon, using a pio de nariz #25 :
Fábrica de Pios de Aves "Maurilio Coelho" : website
Check our review of the #25.