2001年美国一组7枚连号1元折纸错体, 编号 C42431301/2/3/4/5/6/7D. PCGS 66-67PPQ. 均右上角折纸, 编号越大, 错体越轻微. 趣味品 Federal Reserve Note, United States of America, consecutive ERROR $1 (7), 2001, serial numbers C42431301/2/3/4/5/6/7D (Friedberg 1926-C), PCGS 66-67PPQ. All with top right corner folded down, and severity of the fold seems to decrease as the serial number increases. Interesting group (7)