This is a US Plate Block of 6 stamps, Scott 2181, featuring Mary Cassatt. The stamp denomination is 23 cents and it was issued in 1988 in the United States. The stamps are of high quality, being Mint Never Hinged/MNH and are in F/VF (Fine/Very Fine) grade. The color of the stamps is purple and the topic is Art and Artists. The stamps are not certified and were produced in the United States.