VERY nice kaskara, Ian. I agree with Jim's assessment. I might add that it has similar elements to the famed Snake kaskara now in the MET. See attached link. The gold cartouche is striking and may have been inspired by the MET example. I'm eager to see better pics once you receive it.
https://www.metmuseum.org/art/collection/search/27262
The Suakin-Berber railroad the NSW Contingent began through Bega country was ultimately abandoned in place and provided much of the high quality steel used to make weapons by Bega smiths.
Best,
Ed