{| |- | Scott Number C1, C2 and C3. Used copies run about $30 to $40. Mint copies will run $60 to $70. The inverted Jenny, C3a has a value of about $275,000 in mint condition. Many consider these some of the most beautiful stamps issued by the US. |}
That value was valid for airmail postage in 2009. It could be an airmail stamp, there is one picturing the Grand Teton Mountains. Consult a catalog to fully identify the particular stamp.
50 cents as a paperweight.
They do have some value for collectors. And if they haven't been used, they can still be used to mail a letter, with the addition of value to the current rate.
Well, you've got some problems with this stamp, namely that airmail in the US was not used (and even then it was a one-off event) until 1859! Indeed, the airplane would not be invented until 1903. And the first semi-regular airmail service in the US would not happen till 1911 and the first regularly scheduled airmail wouldn't start until 1918 in the US. So check your stamp and post a new question with accurate information.
And invert refers to an error in printing in which one or more colors are 'inverted' in relationship to the others. The error can occur when a stamp is printed on more than one press and one or more sheets is sent through the second press oriented incorrectly. This was more common in the early years, today stamps are printed in a continuous run making it almost impossible to occur. The most famous example would be the inverted Jenny airmail stamp. In the 1960's the US purposely created large numbers of inverts to reduce the value of a couple of accidental sheets with the Dag Hamerskold stamp. The most recent was a high value candle stamp in the 1990's.
No. It's enough to write "Par Avion - By Airmail"clearly in the top left hand corner of your envelope.
There is no requirement that a stamp be certified to be put into an auction. However, having a certification is always a good thing and considering the value, it would be a small fraction of the value. The history of the individual stamps is well known, it would be hard to come up with a fake.
The tulip stamp was marked as the F Flower stamp. It has a face value of 29 cents.
It is a forever stamp. It is good for the current value of a first class stamp.
I haven't seen a sheet for sale recently. But a single Scott # C1 goes for about $.75 You can easily multiply it out by the number of stamps in the sheet. This is the price for buying. To sell is going to be about half that if you're lucky.
The value of a Top Value Stamp, "Toppie," the elephant sign is approximately $42. The better the condition of the stamp, the more money it will be worth.
You would have to identify the stamp using a catalog, there are three or four different issues that this description would fit. Check you library for a copy of Scott's Postage Stamp Catalog of the World. It will help you identify the stamp and its catalog value. A mint copy may have a small value, say half a dollar or so. Minimal value for these stamps in used condition indicates that the cost is in packaging and tracking and not the stamp itself. A dealer isn't going to be interested in purchasing a single copy. You would be better to use it for postage rather than trying to sell it. Or trade with another collector!