US Postage stamps from the last 50 or so years are pretty much worth their face value. In large quantities, dealers will buy them for 80 cents on the dollar. You would be better off using them for postage, unless your really need cash. The US has not devalued their stamps since the Civil War, so any stamp issued can be used for postage.
Air Mail stamps are likely to be worth a bit more, as they are rarer. They are referred to as "Back of the Book" items as they are listed in the catalogs behind the normal postage stamps. Selling or buying a single stamp is usually not worth the effort to a dealer unless they are of high value. They can make their profits on buying in bulk and selling them in smaller lots.
Older stamps may be worth a bit more. High value stamps, the half dollar and up values, are rarer and worth more. To maximize your profits in stamps, you need to fully identify the stamp, including knowing the catalog number, perforations, watermarks, condition and other factors. If you look it up in the catalog there is a price listed. That price is what a buyer should expect to pay a dealer for the stamp. If you are selling, you should consider yourself lucky if you get half that amount.
Look for special markings. Stamps on envelopes can be worth more, particularly with picture cancellations, First Day Cancellations and special locations.
Find a philatelist and ask for more information!
Eleven cents in the United States. To determine if it has additional value, you will need to consult a postage stamp catalog. Check your local library or online catalogs to identify and value your stamp.
Not a great deal. Depending on the specific issue, it might cost you a $1 to buy a mint one, and probably 20 cents for a used one. Not likely to find a dealer that would be willing to purchase a single copy.
That will depend on the exact 11 cent airmail stamp you have and what country it is from. The condition, cancellations, what it is attached to, watermarks, perforations and even color variations can affect the value. You will have to consult a postage stamp catalog to find out.
20 cents.
Without a great deal more information an answer cannot be provided. Consult a catalog on line or in your local library, that will help you identify the stamp and its value.
Air mail stamps are good for ordinary postage- your stamp is still worth 7 cents if unused.
You are probably thinking of the inverted Jenny air-mail stamp --probably the most famous error ever in US stamps.
I believe you mean the, Air Post Special Delivery (1934), 16 cents stamp, because there isn't a 10 cent stamp.There are 4 values for this stamp. This stamp is:Scott Catalog # CE1, (1934) 16 cent, Dark BlueThe values are:Catalog:New = 60 centsUsed =70 centsFace = 16 centsDealer value = 13 cents (20% below Face value)(Scott Specialized Catalog of US Stamps 2011, page 362)
These stamps were issued between 1941-1944. Here are their values:SCN C25 (6 cent): Used = 20 centsSCN C26 (8 cent): Used = 20 centsSCN C27 (10 cent): Used = 20 centsSCN C28 (15 cent): Used = 35 centsSCN C29 (20 cent): Used = 30 centsSCN C30 (30 cent): Used = 35 centsSCN C31 (50 cent): Used = $3.25
You probably have a DC-4 Skymaster red stamp, either Scott number C-39, C-40 or C-41. It has minimal value. Find an online catalog, I'd suggest Mystic Stamps and look at the airmail stamps. I've linked the appropriate page below.
There are four different Canal Zone 6 cent air mail stamps. None of them is worth very much as all of them are common. The highest catalog value for any of the four is 75 cents for C8 in unused condition. You could probably buy any of them in excellent condition, either mint or used, for a quarter or less. You probably could not sell one to anyone. They are so common that anyone who is interested probably already has one or more.
You use an air mail stamp.
98 cents
To send a letter to the UK, First Class (that's Air Mail,) the stamp costs $1.02.
1 or 2 weeks