Colony of Western Australia, Volunteers.
1st Infantry Volunteer Regiment: 1893-1901
This was formed from the Perth (a.k.a.Metropolitan), Guildford and Fremantle Rifle Volunteers.
From diggerhistory.
This design is described in the newspaer article from late 1893, below. The button was similar.
The West Australian (Perth), 17th November 1893 page 6.
Australian Army Museum of WA item AAMWA0001: The Queen’s Colour of the 1st Infantry regiment (WA Volunteer Forces), presented 1896.
http://www.austbuttonhistory.com/25th-november-2021/
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