Coffee pickers, East Java, early twentieth century. Postcards also show the prominent role of women (and children) in coffee picking. Often, the images show people in idealized poses, wearing formal, traditional garb. While this image is clearly posed, otherwise it looks like the photographer simply found some people picking coffee and asked them to pose where they were. This group appears to be a mother with her three daughters.
The coffee plants in the photograph are also of interest. Another card from this series indicates that this is Quillou coffee. This is another variety of C. canephora; the best-known variety of this species is Robusta coffee. My source books disagree on the origin of this variety; some have it coming from Uganda, while others suggest the Gabon or Cameroon. It was introduced to the Dutch East Indies around 1900; breeders there developed improved selections. The Quillou variety was not as widely planted in the Dutch East Indies as the better-known robusta. But it was later introduced to Brazil, where it is known as Conilon.