I have a postcard with a Ben Franklin 1 cent stamp, he is…

Hello! A moderator requested that I assist without a photo. While JustAnswer has requested experts assist with all questions, I cannot provide a complete evaluation with the information provided. In absence of a photo I likely cannot provide specific guidance and comparable-supported values. But can provide general information.

If you're curious about stamps, I recommend checking out the American Philatelic Society, see: https://stamps.org/collect/clubs - which has a list of clubs and dealers. With members in more than 110 countries, the APS is the largest, non-profit organization for stamp collectors in the world. Founded in 1886, the APS serves collectors, educators, postal historians, and the general public by providing a wide variety of programs and services. Mystic is a wonderful stamp dealer with a resourceful site as well: https://www.mysticstamp.com/ Again, thank you and let me know if I may be of any further help with this item.

Thanks! These are common stamps first made in 1903 and they continue to be used until around 1909. See: https://www.mysticstamp.com/Products/United-States/300/USA/

As postal history it's worth $3 to $4 today.

U.S. #300
Series of 1902-03 1¢ Franklin

Issue Date: February 3, 1903
Quantity issued: 11,067,482,974
Printed by: Bureau of Engraving and Printing
Method: Flat plate
Watermark: Double line
Perforation: 12
Color: Blue green