Miniature hand tinted portrait of WWI Australian soldier in silver and gold frame

Hand tinted studio portrait of an Australian soldier housed in a silver and gold decorative oval frame.
The soldier is wearing his greatcoat and peaked cap with the Rising Sun badge visible on the band above the leather strap The unfirom is coloured light brown/khaki, while the background is a pale green.
The cover glass is convex and has a vertical crack running from top to bottom. There are floral decorations (two leaves with a central flower) made from 9 carat rose gold on each side and top and bottom.
The lower edge of the frame has three sets of letters impressed into it relating to the composition of the frame (9 ct gold and silver) and possibly the maker's mark.
The main frame is made from sterling silver which has some decorative engraving in the centre between each floral motif.
The reverse features a backing covered with deep red velvet which is held in position by four tiny metal pins.
There is a metal ring attached to the reverse for hanging.