Forever.
Check out the USPS website for more info.
It is a forever stamp. It is good for the current value of a first class stamp.
A three cent stamp will be good forever for US postage. Every US stamp issued since 1861 is valid for postage.
No, it is not a Forever Stamp.
Yes, it is.
A Forever stamp is good for one ounce of First Class Postage inside the US.
Yes, you can still use a Forever stamp issued by the United States Postal Service in 2009. This was the revolutionary idea of the Forever stamp - you can purchase a first-class stamp at today's price then not have to purchase additional postage later when the price goes up. The stamp is called the "Forever Stamp" because it will be valid forever for a first class envelope.
Yes, that is why it is a Forever stamp. It will FOREVER be worth the cost of an ounce of 1rst class mail.
It will say forever on the stamp. If it doesn't, it may be one of the non-denominational issues that has a fixed price. See the link below.
A first-class stamp is not the same as a forever stamp. A forever stamp holds the value of a first-class stamp regardless of how often the rate for first-class postage has increased. A first-class stamp only holds its face value.
Yes. that is their purpose, to still be valid.
Yes, you can ... forever ...
Yes, you can use a Forever stamp on a postcard, but it's overpaying for postage.