I found plenty with CofA inverted wmk on
ebay. Does this single inverted wmk add a small premium? I have no new catalogue for Australia (1978 Yvert is the latest I have) so catalogue number and any additional information is welcome. I have a few other with the same wmk in normal position (4 penny orange and light-blue etc.), so maybe with this one I can assemble a small lot to be sold on ebay(?)
I know very little thing about Australian stamps


