1913 Forerunners, eleven different, unused, l.h. or h.r., some disturbed gum, mostly fine or better, cat. $4455 (Cat No. Zu.I-VII, X,Xa,XI) (Image)

Cat. $4455, Est.US$1,500

1913 Forerunners, Lugano, 25c green & red, h.r., well centered, minute thin speck, fine example of this rarity, with 2017 Marchand certificate, cat. $4000 (Cat No. Zu.IX) (Image)

Cat. $4000, Est.US$1,000

1913 Forerunners, Lugano, 25c green & red, h.r., well centered, fresh and fine, with 1988 von der Weid certificate, cat. $4000 (Cat No. Zu.IX) (Image)

Cat. $4000, Est.US$1,500

1913 Forerunners, Lugano, 25c green & red, used on flown picture postcard flown from Lugano to Zurich, v.f., rare, cat. $2850 (Cat No. Zu.IX) (Image)

Cat. $2850, Est.US$1,000

1913 Forerunners, 50c red, canceled Sierre Siders (19.V.13) on flown card (Oscar Bider), some creases, minor toning, fine, cat. $3200 (Cat No. Zu.Xa) (Image)

Cat. $3200, Est.US$500

1919 30c brown & green, two singles, used on piece, in combination with two additional stamps, canceled "Islikon 24.XI.21", v.f., with 1984 von der Weid certificate (Zu.1, SFr 3,600) cat. $2600 (Cat No. C1) (Image)

Cat. $2600, Est.US$1,000

1932 15rp green, double impression, h.r., minor gum toning, signed Locher, Tegna, with 1994 Renggli certificate (Zu.16.1.09) (Cat No. C16var) (Image)

Est.US$1,500

1935 10c on 15c green, surcharge inverted, l.h., v.f., with 1999 Eichele certificate. Only one sheet of 50 printed (Zu.20.1A.09, SFr. 17,000 for n.h.) cat. $6500 (Cat No. C20a) (Image)

Cat. $6500, Est.US$3,000

1938 "PRO AEREO" 75c on 50c gray and scarlet, n.h., v.f., pencil signed, with 1995 Rellstab certificate. A rare unused stamp (not regularly sold to the public, but affixed to air mail letters by postal clerks. Only a handful of unused stamps slipped through) (Zu.26) cat. $15000 (Cat No. C26) (Image)

Cat. $15000, Est.US$7,500