Air Mail unused 1920 Air 14Kc. on 200h, 24Kc. on 500h. and 28Kc. on 1000h. variety surcharge inverted; also errors of value 14Kc. on 1000h., 28Kc. on 1000h. and 28Kc. on 500h. and 1922 surcharge set of three variety surcharge inverted, mint. All bear various signatures on reverse. (9)