These are an assortment of mostly Aussie and I saw a U.S. navy pin.
The dark round disk in the first photo is a US WWI collar disk. Most of the buttons and the rest look to be Australian WWI and WWII vintage. Kris(StukaF) would be the Button guy to talk to on the buttons!
"Much that once was, is lost. For none now live who remember it."
The 11th pic. is a ww1 shirt/coat button american. the one next to it appears to be from a military academy. the collar disk with the 132 on it is also ww1 from the 132nd infantry company-D. the rest appears to be a mixture of Austrailian, Canadian and British buttons.
The trade badge in image one is for an "Artificer/Fitter. The Rising Sun (General Service) and the RAAF hat badges are post WW2 Australian Image two,three and four are WW2 Australian general service buttons.Image five are WW2 New Zealand General Service buttons.Image nine I believe are WW2 era RAAF tunic buttons,image 10 are WW2 era RAN service buttons.Image 19 I believe are pre WW2Australian Arty.The button in image 18 with the "Southern Cross" could possibly be pre Australian Federation (1901) and carries Queen Victoria's crown.
Hope this helps.