The "Butterfly" postage stamps were issued in 1977 as part of a set of related and similarly themed stamps that were issued and sold together. The stamps features Swallowtail, Checkerspot, Dogface and Orange-Tip butterflies. Each butterfly represents a different geographic region of the United States.
This listing is for 12 total stamps (3 of each of the 4 different stamps in the set as pictured here).
Please note that if you use the stamps to mail a letter, please make sure that you use the correct amount as required by the United States Postal Service.