Ww1 officers bronze? Rising sun

[badgecollector]

hi all
i picked this up the other day with several british officer bronze badges. it also came with a bronze GS button as well.
i never considered aussies may have had officer bronze type badges but this badge made me think that maybe they did? what are your thoughts? does anyone know for sure?
this badge is also british made with the slider. this type of attachment is often refered to as "light horse" badge. does anyone know why it is refered to as this? surely it was open to anyone who needed a replacement badge while in france/Uk?
this is a beautifuly made badge and is extra nice as it has the tiptaft makers mark.