In most states, hunters are required to purchase both a federal and state stamp before hunting waterfowl. Waterfowl hunting seasons vary, but most begin in September or October, so naturally, stamps are needed prior to opening day of the hunting season. Currently, the federal stamp and more than half of the state stamps are issued in July. Many are issued on the first day of the new year, and a few at the last minute in September or early October. Funds generated from state stamps are designated for wetlands restoration and preservation, much like the federal funds, but with a more localized purpose.
Most state agencies sell their stamps at face value.
However, some also charge a premium to collectors buying single stamps, to help cover overhead costs. Some states also produce special limited editions for collectors. The federal stamp is presently issued in panes of 30 stamps. Most states and foreign governments follow the federal format. Many states issue a 10 stamp pane for ease of handling and mailing to field offices.