Most dealers are not going to be interested in buying a single stamp. You might try selling it on an auction site, but the postage cost will be more than the value of the stamp.
About 13 cents...
7.50
These were issued January 11, 1926.
There is an 11 cent stamp in the presidential series which was current from 1939 to 1954. First class postage was never 11 cents-it jumped from 10 cent directly to 13 cents.
It is worth $21
2 Dollars
This is the forever stamp -- its value as postage remains at the current first class rate. Even when the rate goes up, it can still be used without additional postage. Now it is the same as a 42 cent stamp-- after May 11, it becomes a 44-center.
There was never a 12 cent stamp for regular postage. It went from 10 cents to 13 cents on 12/31/1975. There was however a postage card stamp for 12 cents in 1981.
This is a very common US regular issue stamp. If you want to buy just one it will probably cost you from 10 to 25 cents at a stamp store for a copy, mint or used. 25-40 cents for a mint copy If you want to order it by mail, you would have to pay postage and handling in addition. Dealers get them as part of larger lots for almost nothing per stamp- 65% face and 1/20 cent if used. The money they would charge you for it is mostly for labor.
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)
That is Scott number US 1721. It has a 75 value new and 15 cents used.
Scott #1354. This stamp was issued in 1968. It was part of a ten stamp set printed on single sheets. A mint copy can be purchased online for $1. A used copy is 65 cents.