15 cents.
The C series stamps were issued in 1981. The postage stamp has a face value of 20 cents.
The F series stamps were issued in 1991. The postage stamp has a face value of 29 cents.
US postage stamps do not expire -- they are always worth face value as postage.
The F series stamps were issued in 1991. The postage stamp has a face value of 29 cents.
Flag stamps were 42 cents face value, they were supposed to be forever stamps, postage never to increase from that 42 cents, but that flew out the window real fast.
Face value - use for postage.
Face value for postage remains valid until the government de-values them. In the US, stamps issued since 1865 are still valid for postage. The value to a collector varies based on supply and demand.
New Democratic Network stamps were created to prevent people from having obsolete stamps when the price of postage rises. The face value of a NDN stamp is the current cost of postage at any given time.
Certainly, that is what they were created for, to serve as postage. Just make sure the total face value of the stamps equals the appropriate rate for the envelope or package.
In the US, they are still valid for postage at their face value. The US has never de-valued their postage stamps. For a collector's value, you would have to consult a catalog to identify and value the stamp. Look for one at your library or on line.
It has a face value of 32 cents for the stamps. The G rate stamps were issued in 1995 when postage went from 29 cents to 32 cents.
Nothing more than face value - unless there's something that makes it unique.