Not a lot, you can buy one for around 15 to 25 cents if it is in very good shape. If it is torn it is pretty much worthless.
Air mail stamps are good for ordinary postage- your stamp is still worth 7 cents if unused.
50 cents if unused. Nothing if used.This must be the most common US airmail stamp.
A First Day Cover on the official Teddy Roosevelt envelope is worth about $7 or $8 depending on condition. If it's just a stamp on a plain cover, then it's worth about .50c. The stamp is worth .20 used of envelope.
You probably have a DC-4 Skymaster red stamp, either Scott number C-39, C-40 or C-41. It has minimal value. Find an online catalog, I'd suggest Mystic Stamps and look at the airmail stamps. I've linked the appropriate page below.
The answer depends entirely upon which stamps and their condition. It also depends upon whether they are still attached to an envelope or not. It will also make a difference if it's an airmail stamp rather than regular postage. Most of the stamps are worth about about .20 to .50 cents.
A US first class stamp dated 2002 is worth face value only, and it's still valid now.
how much is a usa forever stamp worth
25 cents.
In perfect condition - 25 cents.
That depends on how it is dated. If it is part of a stamp design, it might be much newer and celebrated an anniversary. If it is a cancellation, it might have some value. Consult a good stamp catalog to identify the specific variety.
Scott US#1500 1501 1502 and C86There were four stamps issued in a set in 1973. If there is one stamp on the envelope, it is probably worth about a $1. If one envelope contains all four stamps, it would be worth a bit more.
Most collectors prefer to have the stamp in its original position, on envelope or document. This shows the usage of the stamp as it was intended and will have more value than the stamp by itself.