Issuance
Duck stamps are now issued by the United States government and all state governments. Many foreign countries, including Canada, Australia, Mexico, Russia and the United Kingdom have also issued duck stamps.
The issuing authorities within the various governments that release duck stamps are usually conservation and wildlife departments. These programs must be created by some form of legislation for the resulting stamps to be accepted as a valid governmental issue. Labels featuring ducks also are issued by various special interest groups, such as Ducks Unlimited and the National Fish and Wildlife Foundation. Their issues are referred to as "society stamps." These items technically are not duck stamps because the fee structure and disposition of funds are not legislated. However, society stamps are very collectible and often appreciated. Funds raised by these organizations are also used for waterfowl and conservation efforts. Valid organizations and societies of this type perform a major service to conservation by their donations and efforts, and they merit public support.
Read more about this topic: Federal Duck Stamp