South Australia Militia

According to Cossum, this dates c.1886

Smith & Wright Birmingham (?1860-90s).

South Australia’s military forces did not really exist in a stable, ongoing sense until 1877, with the successful reformation of 10 companies of Adelaide Rifles and a couple of artillery batteries. In 1885 a second infantry battalion was reformed (having previously been started then merged) and then in 1889, a third battalion. Even then, the forces were under-numbered, with insufficient training and resources. Many felt the defence expenditure to be a waste of time and money. This button dates from this last era.

https://guides.slsa.sa.gov.au/c.php?g=410211&p=2794489

https://en.wikipedia.org/wiki/Colonial_forces_of_Australia

https://manning.collections.slsa.sa.gov.au/sa/defence/defence.htm