Airmail, 1941, 6¢ Transport, imperf between. Horizontal error pair in strip of 4, o.g., never hinged (right normal stamp hinged), left error stamp with blue examiner's crayon marking (somewhat smudged), Very Fine, only 20 pairs issued; with 2006 P.F. certificate & signed Kessler. Scott No. C25b  $2,250+. $0 (Image)