Varieties also exist in the perforations. Stamps with large clear margins always demand a premium as do copies in multiple formats. They are desirable as they cover interesting occupations. They are intricately engraved with large vignettes and vary in color by the year issued. For example the Peddler Third Class stamp covers the annual fee for a peddler of tobacco who travels with one horse, mule , or other animal.
Revenue stamps are a wonderful collecting avenue to take.
I've barely touched on the some of the more common areas. Revenue collecting is an exciting area which highlights the best of philately - rich in history, fine engraving and pure beauty. A wealth of knowledge and support can be gained from the organization's publications and activities. Beginning collectors are welcome to request a small sample of U.S. Revenues free of charge if you send a self addressed, stamped envelope to me. Also, feel free to e-mail me with any questions or requests regarding revenue collecting or ongoing promotions that I might have.