They certainly can be. Many collectors prefer working with used stamps. Rarity and condition will determine value. Some of the most valuable ones in the world are used and posted.
There are many ways one can learn the value of stamps from Japan. One can learn the value of stamps from Japan at popular on the web sources such as Baxley Stamps and Herrick Stamps.
Value entirely depends on what stamps are in the album. Without knowing what stamps, country and condition, it's impossible to value.
Top Value Stamps are no longer in circulation. They were a redemption program where stamps were collected and exchanged for merchandise from a catalog. If you still have Top Value Stamps, you would not be able to redeem them as the program no longer exists.
You cannot use the Forever Stamps on foreign postage. The international agreement indicates that value must be shown on stamps used for international mail. The current cost for up to one ounce is 98 cents.
What is the value of a sheet of Appollo 8 stamps?
What stamps? First postal stamps were used in 1840.
No they are not Forever stamps. They were issued in 2006 and have a value of 39 cents.
"A " stamps are the same as 15-cent stamps.
That will depend on the value of the stamps you have. If you have one cent stamps you will need 190 of them. If you have ten cent stamps you only need 19.
The value of the Apollo 8 stamps depend on condition and if they are singles or in sheets. Sheets of these stamps in mint condition are valued between 15.00 and 18.00 as of 2014.
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An easy way to find good value for your stamps is to buy a stamp magazine. Linn's is a good one.