ARGENTINA, 1930, 50c and 1p Zeppelins, Inverted Overprints (C21a, C22a). 50c Mint N.H. with l (Image)

E. $ 300-400

ARGENTINA, 1930, 3.60p Zeppelin (C24). Mint N.H. block of six and strip of three (originally (Image)

E. $ 500-750

ARGENTINA, 1930, 1.80p Zeppelin, Green Overprint (C29). Mint N.H. block of four with selvage (Image)

E. $ 750-1,000

BOLIVIA, 1930, 5c on 10c to 50c Zeppelins, Double Overprints (C11b-C16b). Complete set of fiv (Image)

E. $ 400-500

BOLIVIA, 1930, 10c Vermilion & Black, Brown Overprint (C13). Large part original gum, strong (Image)

E. $ 500-750

BOLIVIA, 1930, 15c and 25c Zeppelins, Inverted Overprints (C14a-C15a). Blocks of four with se (Image)

E. $ 300-400

BOLIVIA, 1930, 50c Orange & Black, Red Overprint (C17). Original gum, attractive color, Very (Image)

E. $ 300-400

BOLIVIA, 1930, 1b Red Brown & Black Zeppelin (C18). Block of four with part imprint in the bo (Image)

E. $ 300-400

BOLIVIA, 1930, 5c on 10c to 1b with Bronze Ink, Inverted Overprints (C19a-C23a). Complete set (Image)

E. $ 500-750

BOLIVIA, 1930, 1p Red Brown & Black, Gold (Bronze Ink) Overprint (C23). Lightly hinged, rich (Image)

E. $ 200-300

BRAZIL, 1930, 5,000r-20,000r Graf Zeppelins (4CL1-4CL3). Mint N.H. blocks of four with selvag (Image)

E. $ 500-750

COLOMBIA, 1935, 2c-10p Olympics (421-436). Mint N.H., well-centered and exceptionally fresh t (Image)

E. $ 500-750

COLOMBIA, Curtiss Aeroplane Co., Promotional Labels. Set of nineteen labels, each with selvag (Image)

E. $ 5,000-7,500

COLOMBIA, Curtiss Aeroplane Co., Promotional Labels. Set of eleven labels, each with selvage (Image)

E. $ 1,500-2,000

COLOMBIA, 1889-95, 10c Red on Yellowish, Registration (F10). Blue registry number 7108, used (Image)

E. $ 300-400

COLOMBIA, 1895, 10c Deep Brown on Rose Buff, Registration (F11). Handstamp registry no. 1030 (Image)

E. $ 500-750

COLOMBIA, 1892, 10c Brown on Light Buff, Registration Stamp (F12). Blue registry number 8009, (Image)

E. $ 500-750

COLOMBIA, 1892, 10c Yellow on Light Buff, Registration Stamp (F12). Manuscript registry numbe (Image)

E. $ 1,000-1,500

COLOMBIA, 1892, 10c Yellow Brown on Light Buff, Registration (F12). Vertical pair with ms. re (Image)

E. $ 200-300

COLOMBIA, 1900, 10c Orange, Handstamped "R", Provisional Registration Stamp. Blue registry nu (Image)

E. $ 400-500

COLOMBIA, 1902, 20c Red Brown on Blue, Registration (F13). Ms. registration no. 2576, used wi (Image)

E. $ 200-300

COLOMBIA, 1903, 20c Blue on Blue, Registration (F17). Ms. registration no. 9402, used along w (Image)

E. $ 300-400

PANAMA, 1887, Pink Official Registration Envelope. Printed envelope with ms. registry number (Image)

E. $ 500-750

PANAMA, 1888, Black on Gray Registration Stamp (F1). Blue registry number 6817, used along wi (Image)

E. $ 500-750

PANAMA, 1898, 10c Orange, Registration Stamp (F2). Ms. registry number 3574 to left of stamps (Image)

E. $ 300-400