That is known as an Erke.
The erke (alternatively erque, coroneta, or quepa) is a large labrophone (lip reed) instrument native to the Gran Chaco of Bolivia, northern Chile, and Argentine Northwest. (SOURCE: Wikipedia)
(PHOTO CREDIT: By N J.O. Zavalía - https://www.flickr.com/photos/122267223@N07/13614627804/, CC BY 2.0, https://commons.wikimedia.org/w/...
Often it's a case of chasing through libraries, recordings, and memories. The Library of Congress has a large amount of old sheet music.
A source for early tangos is Todotango.com.
You can search for melodies or lyrics (mostly melodies.) There are ...