federal stamp question

[duckkillerclyde]

since it is a federal stamp, if unsigned, may I mail something with it?

[duckkillerclyde]

before it expires of course. 

[huntingfool7]

Does signing it void it for mailing packages?

[pianoman9701]

I believe I asked that question and it's not valid postage, signed or not.

[bobcat]

I found this: 

If you want buy a Duck Stamp, where can you get one?  Even though you can’t use these stamps to mail a package, you can find them at U.S. Post Offices.  They’re also found at national wildlife refuges, and at lots of sporting and outdoor stores - even at stores like Walmart and Kmart.  You can also buy Duck Stamps online.

http://www.fws.gov/news/blog/index.cfm/2011/8/10/Putting-a-Stamp-on-Conservation

[pianoman9701]

Here's the information from USPS.com:

Duck Stamp for Hunting

The Bird Hunting Stamp (also known as a "Duck Stamp") is a license (permit) in the form of a stamp allowing the purchaser to hunt migratory birds. It is:

Valid only for the current hunting season (check your local hunting information for details, including valid dates and legal hunting areas).
Many state and federal laws regulate the hunting of Migratory birds.
Some states require additional permits for hunting birds, as well as specific species of bird, locations, etc.
There are too many laws that regulate hunting to list them all, and callers should instead contact local authorities.
Sold for $15.00 at many (but not all) postal facilities. (They are also available at locations other than Postal Facilities)
NOT usable for postage.
Often purchased by collectors (including expired stamps from prior years).
Ninety-eight cents of every dollar from the sales of Duck Stamps goes to the purchase of wetlands
The Migratory-Bird Hunting and Conservation Stamp is required with a valid hunting license in order to hunt Migratory birds and Ducks.

Note: Please note that the receipt for the purchase of your Federal Duck Stamp is not legal to hunt with. You must have the actual signed Federal Duck Stamp on your person while hunting any migratory waterfowl. Even in states where electronic licensing is used, you must have a signed Federal Duck Stamp.

source link:
http://faq.usps.com/eCustomer/iq/usps/request.do?session={3df6a820-7d10-11e2-feb3-000000000000}&event=1&view()=c%7B0f446c00-57e2-11dc-51b6-000000000000%7D&objectId=&eksObjectId=&objectType=Case&isJumpEnabled=false&isContentJumpEnabled=false&vendorKey=&objTitle=&versionId=10323&searchProperties=undefined&naturalAdvance=false&allStr=&phraseStr=&anyStr=&noneStr=&keywordStr=&tTitle=&topicFromSub=&topicsORSubUrl=&report(0000)=p{409592d0-6974-11dd-e6c4-000000000000}&bcobjectId={ceff8d00-6974-11dd-e6c4-000000000000}&search=duck stamp&topicAndSubtopic=Business$ALL