There have been hundreds of 1 cent stamps issued by many different countries. You will have to identify the specific stamp by using a catalog or reference book. That will also provide an estimated value.
1 cent
1 cent
Without knowing the date on the stamp, a description and condition, it is impossible to value a stamp.
Not much maybe $1 or $3 at the most.
1c 1 cent
post card with 1 cent stamp date of 1911
1 cent.
20 cents retail. 1 cent as postage.
The lowest value US stamp was the 1/2 cent. A couple different versions were issued.
Price for this stamp varies from 0.15 cents to 1 dollar according to condition.
The H stamp is worth 33 cents. Yes, you can add a 1 cent stamp to cover 34 cents worth of postage.
Scott Catalog #: 3468AValue is about 50 cents used and a dollar mint. Few dealers will be bothered with buying a single stamp.