1974 18¢ Elizabeth Blackwell Plate Block

United States #1505 10¢ Chautauqua Plate Block

United States #1549 10¢ Retarded Children Plate Block

United States #1526 10¢ Robert Frost Plate Block

United States #1529 10¢ Skylab Project Plate Block

United States #1528 10¢ Horse Racing Plate Block

United States #1527 10¢ Environment EXPO Plate Block

United States #1547 10¢ Energy Conservation Plate Block

United States #1550 10¢ Christmas - Angel Plate Block

United States #1400 21¢ Amadeo P. Giannini Plate Block*Plate number and position may vary from image shown.