Official Seal, 1947, gray black, perf 8½x8. Four seals used to seal flap of cover opened in error, tied by "Anderson Mo. Mar 10 1948" purple cds, mailed with #C33 tied by "Los Angeles Mar 2 1948" machine cancel, returned to sender for better address, Fine, one of only two recorded covers. Scott No. OX33  Estimate $200 - 300. $0 (Image)