I'd appreciate help identifying these WA postmarks. The first is a diamond numeral, but WA didn't have diamond numerals (did it?) and in any case the numbers didn't go as high as 80. South Australia did have diamond numerals, but I don't think they had this pattern. Does anyone know what it is?

This one is presumably a government department of some kind. P. O. E. G. perhaps? Does anyone know for sure?
