Chances are that it is not valuable.
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There are two notable issues, both fairly old but common:
There is a 1962-1963 light blue George Washington, which was being offered 4 for 99 cents in 2015.
There is also the 1967 darker blue, which was also worth about face value.
You can locate these by their Scott catalog numbers: 1213, 1232B (pane/booklet), 1283
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The much rarer 1908 issue may be valuable if in excellent uncancelled condition
(see Scott 335)
3-5 cents
It is worth the original cost of the stamp.
$5.00 on Ebay
Depending on which version of the stamp, it is worth between $5.00 and $1,000,000.00.
It is worth 15 cents.
The stamp-postage value of a stamp is visible on the front of the stamp.
If it says US Addresses Only it is good for 32 cents worth of postage. The Make Up stamp is worth 3 cents.
With dozens of Washington stamps of so many varieties, this is pretty hard to pin down without know exactly which stamp it is. Most used US postage stamps are worth 15 or 20 cents, the minimum amount required to catalog and stock the stamps. Unused will always be worth at least their face value. Special cancellations and different values are likely to be worth more. Consult a postage stamp catalog, usually available at your local library for exact identification and catalog values.
value of silver stamp holder
.32 Cents
$0.20
Firstly, the stamp is NOT from 1732, as that was the year Washington was born. Some people ask the moon for one, but a used specimen is only worth a few dollars.