The best way is to consult the USPS web site. They list all of the stamps issued without a value. These stamps can still be used for postage at that value, so other stamps have to be added. They can only be used for US addresses.
The H stamp was the one with the Hat on it. It has a face value of 33 cents.
A G stamp has a face value of 32 cents. You would have to add 27 cents to mail a letter with it.
4 cents. Put it on your next letter.
The value at purchase was 63 cents wich was the value of a 2 OZ letter but I would like to know the current value, if it is more than 63 cents.
That stamp was issued in 1985. It has a face value of 22 cents.
According to the website United States Non-denominated Stamp Values, the face value is 37 cents.
The price of a stamp went from 15 to 18 cents. So the face value of the B stamp is 18 cents. The B make up stamp would be worth 3 cents.
The D stamp would have a face value of 22 cents. There was a make up rate stamp with a value of 2 cents.
If memory serves, it is the oversized, mainly black and white stamp you are asking about. If so, sorry to say, but you can use it on a letter. If it is used, even less value.
Five cents was the value. That was the cost of mailing a half ounce letter.
The F stamp was a picture of a Flower. They matched the picture to the letter. It has a face value of 29 cents.
The tulip stamp was marked as the F Flower stamp. It has a face value of 29 cents.