Most current FDC covers can be purchased for a dollar or so from a dealer. Which means you might be able to sell it for half that. Specialty catalogs for FDCs can also give you more value.
25 cents.
Scott US#1270If it is a first day of issue, it should have a cancellation. A First Day Cover is likely to be worth about a dollar. Without the cancellation it is worth the same as a used stamp, about 15 cents.
25 cents max.
First class stamps in 1991 went to 29 cents in February so December, first class Christmas stamps should have been worth 29 cents.
In perfect condition it is worth 25 cents.
The stamp alone is around $1. You could get around $2 for the first day cover, it has a nice cachet and is pristine.
Unmarked means it is not on cover and not cancelled. Which means it can't be a First Day of Issue. A First Day of Issue cover could cost 2 or 3 dollars. The individual stamp can be purchased for less than a dollar.
A First Day Cover on the official Teddy Roosevelt envelope is worth about $7 or $8 depending on condition. If it's just a stamp on a plain cover, then it's worth about .50c. The stamp is worth .20 used of envelope.
well to a collecter on a good day $2000
Possibly a 1.00 depending on condition.
5 cents
The US has issued dozens of stamps in 1922. You will have to completely identify the stamp to find a value. A catalog, available in most libraries can help you determine the value. Chances are a dealer won't purchase a single stamp unless it is worth more than a dollar or two.