WW1 officers collars

[badgecollector]

hi all
a couple of my new officers collars
rissing suns are J R Gaunt London Gilt, i have the hat badge to match
the others are officers enameled collars of the australian engineers. not sure what period but im thinking pre WW2. officers collars to go with the ORs i have.
these collars not listed in Cossum. any help to date appreciated
cheers
both sets belonged to a Lt. Col WW1 and finished up a Brigadier.
BC