Which one? Without knowing which one and the condition, it really isn't possible to give you a decent answer. Most aren't worth much - about .20
Czechoslovakia.
can anyone tell me wow much it is worth\ the stamp was circulating in 1957 or 1958
Today (February 4, 2015) it is worth 80 cents US.
A First Day Cover on the official Teddy Roosevelt envelope is worth about $7 or $8 depending on condition. If it's just a stamp on a plain cover, then it's worth about .50c. The stamp is worth .20 used of envelope.
2 cents. Unless the stamp is a collector's item (which very few are), an un-circulated U.S. stamp retains the same value as the day it was sold.
That depends on many factors. A stamp is worth its face value for use as postage. If you have something that is old and is rare, it could be worth some money. Today's First Class postage stamps are 44 cents.
It is worth the original cost of the stamp.
True
Very little, the amount of gold is so small as to not be measurable.
A stamp is worth more unused
Just about what is was worth in 1966, more than likely, without any adjustment for inflation.
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.