This US 1940 Scott #874 Block of 4 American Scientist John James Audubon stamps are a great addition to any stamp collection. These stamps feature a beautiful green color and are in VF/XF (Very Fine/Extremely Fine) grade. The stamps are uncertified and have never been hinged, making them a unique find. The stamps were manufactured in the United States and feature historical figures, making them a great conversation starter. These stamps are perfect for collectors who are looking for something rare and unique to add to their collection.