There is a whole area of collecting of revenue stamps. They start with blind embossings of the paper such as the one shown here and then go into colored embossings and all kinds of postage stamp like stamps but with the appropriate wording. Also, there have times in some countries where the same stamps can be used for either postage or revenue purposes. Often the best way to tell the difference in such cases is when they were used for revenue purposes they typically had manuscript cancellations, though sometimes they had straightline date cancels and such. If you look at some older British Empire stamps you will see some that say "postage and revenue" in their designs such as this one:
Posted 04/11/2016 07:49 am
