That can get to be pretty tricky! For First Class mail you need to use a stamp or combination of stamps that matches the current cost of 41 cents for the first ounce. Depending on what type of mail, businesses can get all sorts of discounts for sorting things, having the nine digit zip code and meeting other requirements. A quick visit to the USPS web site will give you the current rates and requirements. They also have a page that will show you what the value of the non-denominated stamps.
Forever
The current value for a standard postage stamp is 46 cents.
The F series stamps were issued in 1991. The postage stamp has a face value of 29 cents.
Face value of the original stamp was $0.20
The stamp-postage value of a stamp is visible on the front of the stamp.
The face value of the D stamp was 22 cents when issued in 1985.
96214455 doollars
15 cents.
There are many factors involved to determine cost. Stamps of this era were produced in large quantities. If the stamps are on envelope, they could be worth more than a mint or unused stamp. Consult a catalog to identify the stamp and to determine a value. You can find them at your library.
That will require a more detailed identification to figure out what the value is. Consult a postage stamp catalog, Scotts is a standard in the US. It should be available in your local library. It will help you determine the specific stamp and provide a value for you.
value of silver stamp holder
Face value only