All forms issued by Western Australia during the Interim period (1901-1917) can be accessed from this page:
All Interim forms had the heading COMMONWEALTH OF AUSTRALIA and a reference to Western Australia.
Transmission forms (ordinary rate).
Two formats for ordinary rate transmission forms were issued by Western Australia during the Interim period.
Transmission forms (urgent rate).
Delivery forms (ordinary rate).
Five formats were used for the ordinary rate delivery forms during this short period in Western Australia. There were many variations within each format - especially for Form DO-2.