The US has issued many dozens of red 3 cent stamps. It will take a bit of work to identify which stamp you are referring to. I would recommend spending some time looking at a US Postage Stamp Catalog to identify the specific stamp. The bonus is that most catalogs will give you an idea of value.
About 15 cents.
Forever
The current value for a standard postage stamp is 46 cents.
The F series stamps were issued in 1991. The postage stamp has a face value of 29 cents.
The American Federation of Labor was founded in 1886 and led by Samuel Gompers. The union resulted when groups of disenfranchised craft workers from the Knights of Labor formed a new union. During the first half of the 20th century, the AFL was the largest labor union in the country.
Face value of the original stamp was $0.20
The stamp-postage value of a stamp is visible on the front of the stamp.
The face value of the D stamp was 22 cents when issued in 1985.
15 cents.
96214455 doollars
value of silver stamp holder
Face value only
15 cents