How do you know it is rare? Granted, stamps from the 1860's are not all that common, but there were many that are relatively common and worth only a few dollars. Others are extremely rare and could be worth a lot. Identify the exact stamp using a catalog. This could involve learning about perforations, watermarks and colors as well as condition. The catalog will provide a value. The value is what a collector could expect to pay for a stamp in fine/very fine condition. If selling, most cases you would be lucky to get 75% of the catalog, unless it is very valuable, then an auction would be worth looking into. Dealers would be able to take a look at the overall collection and make an offer. Find a local dealer throught the American Stamp Dealers' Association. The most common American catalog for identification is Scott's. Others are Stanley Gibbons, and Minkus.
The value of US commemorative stamps varies depending on type and issue guide. They can range anywhere from a minimal value for a used stamp to thousands of dollars for a rare mint condition stamp. There are many US stamp price guides that can be obtained to find out a catalog value. Stamps in the US that are unused can always be used for face value as postage.
Stamps from Spain are marked 'Esapan.' Value varies from the minimal 15 cents to thousands of dollars for the rare and unusual. Chances are you have the low value common stamps, though you might have a few of the high denomination stamps with a dollar or two value. Consult a stamp catalog at your local library to learn more about them.
Ordinary stamps were 3 cents each in 1916 .
{| |- | Price listings for rare stamps are referred to as Catalogs. Your local library will typically have one or more of these, Scott's being the most common in the US. It will give you descriptions and pictures of the stamps, as well as directions on how to identify and grade them. |}
No delafield rubber stamps are not rare they are freely available on ebay
15 cents.
No you cannot use them. Forever stamps can only be used for domestic (inside the US) mail. They must have a value on them for international mail.
First of all you have to be sure it is 'rare.' There are hundreds of six cent stamps that have been issued, some well over 100 years old. They could be worth anything from 6 cents for postage if unused to hundreds of thousands of dollars. The first US 6 cent stamp #115 was issued in 1869 and the mint version can be purchased for $1,750. There is a 1909 #362 that is worth $18,000 if used on envelope.
US postage stamps do not expire -- they are always worth face value as postage.
There were 3 stamps in that series, so it could be Scott number US 1504-6. A full sheet of these stamps has a catalog value of $15.75 or $22.50 depending on which one it is.
In the US, they are still valid for postage at their face value. The US has never de-valued their postage stamps. For a collector's value, you would have to consult a catalog to identify and value the stamp. Look for one at your library or on line.
The H stamp has a value of 33 cents toward postage. The H Make-up stamps are worth 1 cent. Both are valid for postage within the US at that value.