I have collected and exhibited Australian States Revenue and Railway Parcel Stamps for over 40 years and have much information on my web site. ozrevenues com [add in the dot]
This is a learn only site there are no items for sale. Enjoy
Dave Elsmore Queensland Australia
Below is taken from one of my website links:
Definition of a Revenue Stamp
A revenue stamp is defined as embossed, impressed, adhesive,
imprinted, fee or credit, issued by or under the origination authority
of a state or municipal or intermediate governmental authority, their
licensees or agents, and indicate that a tax has been paid or prepaid.
Definition of a Railway Stamp
A railway parcel stamp is by definition a revenue, as is evidenced by
prepayment to a government body for a service. In Australia, tramway parcel
stamps, should be treated the same as railway parcel stamps, the monies collected
for the prepayment of this service was by a municipal governmental authority.