Messenger stick, before 1931

wood, light brown patina, delicate round staff carved with signs and symbols (by incised lines lengthwise subdivided in two halves, each with triangular patterns that are tooth-like meshed), traces of old age.
According to enclosed file card: "Rain stick ("him singer rain") bought from Frankie, a fullblooded aboriginal, at Birdum, Northern Territory, Australia, Jan 1931".