I presume you mean the large black, red and blue 6 cent stamp
issued in 1969 to honor Eisenhower's death.
In used condition, one dealer that I know will buy this stamp at $ 0.50 per hundred
if you pay postage and have a total of $50 worth of stamps to sell.
Unused it is worth 6 cents as postage - a dealer would not likely want
to buy just one.
If you want to buy one from a dealer, the price would be from 10-20 cents used or unused, but most dealers have a minimum order amount and a postage/handling fee.
Gold stamps are worth the least amount of money. If you get a green stamp it is worth a couple hundred dollars. The black stamp is priceless.
At least eight cents, forever.
8 cents.
A 1990 penny black anniversary stamp can be worth five dollars or more. The specific price will vary depending on the rarity of the stamp on the time of sale and condition.
It is worth the original cost of the stamp.
It depends on the condition. Typically this stamp is worth the minimum value, about 15 cents, to cover the cost of cataloging and storage. A dealer is not likely to give you any money for one, it isn't worth the hassle and he can't make any money on it.
A stamp is worth more unused
About eight cents, so you might need a couple more to mail something.
It is worth the cost of the stamp.
A 5-cent 1946 Roosevelt stamp is worth about $1, but it depends on the postmark and the design on the stamp. Some postmarks of this stamp could be worth $11 or more.
every stamp is worth it
The stamp-postage value of a stamp is visible on the front of the stamp.