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It is made from a curved wooden stick, with tapered ends. It was collected by Dr Walter Edmund Roth in 1895, and purchased by the Australian Museum in 1905. Roth gives a description of this toy, and how it works;

It is thick, rounded, from 18 to 20 inches in length, pointed at both extremities, but strongly bent: one can hardly help suspecting, in fact, but that this toy is a stage in the evolution of the boomerang from the nulla-nulla or straight throwing stick. It is held, convex side forwards, firmly in the hand, simultaneously pressed close against the extended forefinger; it is thrown downwards against a log or thick branch lying on the ground, from which it rises into the air in a straight direction, revolving in its flight on a more or less horizontal plane.

North-West-Central QLD. Walter Roth. Ethnological Studies among the North-West-Central Queensland Aborigines,1897.

More information
Haagen, Claudia, Bush toys: Aboriginal Children at Play, Aboriginal Studies Press Canberra, 1994