Forever stamps have the value of the current First Class Postage Rate. Currently they cost 44 cents. They can be used 'forever' to mail one ounce of US Postage.
No, it is not. It was a non-denominated postage stamp issued for the rate change in 1985 to 22 cents. It can be used for 22 cents of postage within the US, so two of these will mail a First Class...
A forever stamp is a stamp that is valued (sold and cancelled) at the current local letter rate of postage. For example, if the current cost of local postage is 50 cents, the forever stamp is valued...