The value of the Elvis stamp advertisement hanging in post office is really worth much. It is not worth much because it is not real.
$.30
yes, you pretty much ALWAYS need a stamp to send a letter in the mail. :)
A first class stamp was 3 cents in 1923. A post card would cost you a penny.
A postcard is $.28.
As of January 25th 2008 it is .26 cents
At that time a first class stamp was 37 cents. And a post card cost 23 cents.
A first class stamp was 29 cents on that date. For a post card it was 19 cents.
If you're looking for the financial value of this particular postage stamp, you'll have to consult a "Stamp Collector's Book." The year, type of stamp, date of stamp, date of post mark, and condition of the stamp will have to be compared to that described in the collector's book. Almost all book stores sell stamp collector's books.
1 Euro
First Class Postage is currently 44 cents
Say your post stamp is 30mm lengthways, it would then be 0.00003km.