Photograph Private collection of Wolfgang Wiggers (Wolfgang Wiggers, 3 November 2020) There's a handwritten capture in german on the reverse:
"Indianer aus der Umgegend von Valdivia, 1901". (Indians from the vicinity of Valdivia).
I think that they are Mapuche. The Mapuche are a group of indigenous inhabitants of south-central Chile and southwestern Argentina.
