You will need to consult the catalogs. This is a tricky time period to identify the specific stamp so spend some time working. Most libraries will have a copy of Scott's Postage Stamp Catalog of the World. First of all, you have to identify the specific stamp or card. That in itself can be a daunting task, but most of the catalogs are well illustrated with lots of information. Once you know what item you have, the catalog will provide a set of prices that can be used to estimate value.
The Scott catalog number for this stamp is 2137. The breadwagon stamp was not issued in 1866, it was issued about 1981. The item pictured was made in the 1880's. The stamp has a minimal value used and can be purchased for about a dollar mint.
That stamp is Scott Number US 2263. It was issued in 1988. It has a value of 20 cents used and 35 cents mint.
Josiah Stamp was born on June 21, 1880.
Josiah Stamp was born on June 21, 1880.
{| |- | Scott Number 2257 It has a First Day of Issue of 4/11/1987, not 1880 that was printed on the stamp. You can purchase one of these for 20 cents used and 40 cents mint from a dealer. Dealers typically will purchase stamps at around 25% of the catalog value. Consult a stamp catalog such as Scott's, for a description on how stamps are rated and graded. |}
Scott Number 1902 - 7.4 cent Minimal value for this stamp 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!
1 cent.
1880 minted S
That is Scott Number US 1902 issued in 1984. It has a minimal catalog value of 20 cents mint and 20 cents used.
The mintmark (if it has one) is on the reverse under the eagle.
That would be Scott number US 1897 or 2225. Both versions have a catalog value of 20 cents used and 20 cents mint.
August 29, 2009 The more common 1880-CC dollar in MS65 grade has a value of $1625. The less common Proof-like 1880-CC dollar in MS65 grade has a value of $1900. The scarce Deep Mirror Proof-like {DMPL} 1880-CC dollar in MS65 grade has a value of $11,000.