(Royal) Victorian Volunteer Artillery regiment
On Cossum pages 14 to 17 there are 13 versions of Victorian Artillery uniform buttons, dating from 1856 until 1903. In October last I shared one of my treasures, a 1856-9 VVAR button sporting a forward facing field gun under the Queen Victoria crown and over the initials VVAR.
http://www.austbuttonhistory.com/8th-october-2021/

Damaged no shank or back plate.
In 1859 the Royal title was bestowed, and button made bearing the letters RVVAR with both a forward and a left facings field gun; also a version with 3 stacked left facing field guns. I certainly would like these!

Courtesy Noble Numismatics: VVAR (far right) and RVVAR buttons,

Typical Artillery buttons from pre-Federal period.
Williamstown’s Volunteer Artillery had its own design with the letters W.V.A. There also exist ball-type buttons for the horse artillery units.

State Library Victoria: http://handle.slv.vic.gov.au/10381/251026 St Kilda volunteers of R.V.V.A.
Williamstown Volunteer Artillery
This regiment existed from 1860-1884.

The Argus (Melbourne), 22nd March 1860 page 5.

The Argus (Melbourne), 22nd March 1860 page 5.

From diggerhistory