Maybe you can find information about the school in:
a) Mitteilungsblatt der NS. Deutschen Arbeiterpartei Landesgruppe Argentinien;
b) Der Trommler, NS. Zeitschrift in Argentinien.
These mastheads I showed in my handbook:
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I saw there is an article in Spanish on Facebook. Maybe you can find something
on the Internet.
For your interest two other schools in Argentina with their symbols: