It depends on the specific stamp and the type of flaw. A flaw caused by a cracked plate can be important, but may not create a large change in value.
Nothing you idiot! If it doesn't have a serial stamp on it, it's gay and worth crap!
Depends on the stamp and the plate numbers. Since the 40's, many people saved plate blocks from their sheets of stamps. Many of them are very common and can be purchased for about 5 times face value. Consult a specialized catalog to find specific values.
It is not worth anything
It depends on the plate maker and occasionally the number. Typically the lower the number the higher the value
There is no 1881 Roosevelt stamp. The earliest stamp issued with a Roosevelt, Teddy, was in 1922. Scott number 557 is worth 45 cents catalog used and about $30 in mint condition.
franklin mints just married plate number HJ5867 how much is it worth?
Nothing.
This stamp is Scott's number 231. A very fine used copy is worth about 10-15 cents; mint is about $8.00.
It is worth the original cost of the stamp.
A stamp is worth more unused
This stamp is Scott number 1845. It can be purchased for about 20 cents used and in mint condition.