In 1920, Czechoslovakia as one of the first European countries inaugurated an international air service.
As airmails, the stocks of the current set of stamps bearing the picture of Hradany were used, imperforated and line perforated 13 3/4 as well as comb perforated 13 3/4 x 13 1/2, overprinted with the picture of an airplane and the new denominations.
Counterfeit overprints exist on unused and used postage stamps, carried out in a wide range of craftsmanship, from very primitive to the most successful specimens.
The mint set became sought after only after the official destruction of remaining supplies in the year 1933.
Counterfeit overprints appear on mint as well as on used denominations.
Complete counterfeits were produced as well.
The mint set became sought after only after the official destruction of remaining supplies in the year 1933.
Counterfeit overprints appear on mint as well as on used denominations.
Complete counterfeits were produced as well.
Genuine Stamps
Specific features of the 14Kc
14 Kc ultramarine
Overprint red-brown, with metallic luster.
Validity: imperforate, August 11, 1920 to April 30, 1921
perforated, September 14, 1920 to April 30, 1921
Imperforate
Perforated 13 3/4
Perforated 13 3/4 x 13 1/2
Overprint performed by typography
Overprint dimensions:
a. 26.5 mm.
b. 25.0 mm .
c. 4.5 mm.
1. Note the number of struts and their directions
2. Clearly defined insignia with one horizontal line in the inner circle
3. Round head of pilot with a strut attached
4. Oval shaped wheels with a wider left side and a dot in the center.
5. Shaded propellers
6. The bottom of the “C” longer than the top & note the opening width
7. The width of the propellers is 25.0mm
8. Shading inside the centers
9. Curved left side and inclined top of the “4”
10. 3 dark areas
11. 3 dots in this section (difficult to see)
12. The rudder line has a step on it
13. This area is rounded
14. Sharp, even sided support strut
15. Note the slope of this wing tip
16. Note the length of the serif
Specific features of the 24Kc
Imperforate
Perforated 13 ..3/4
Perforated 13 3/4 x 13 1/2
Overprint produced by. typography.
Overprint dimensions:
a. 26.3 mm.
b. 2 S . 7 mm.
c. 4.3 mm.
1. The head of the pilot is joined to the aircraft wing by means of a vertical line.
2. Supporting strut intersects four lines in the wing.
3. Below the white area in the rudder there are three white dots.
4. The wheels of the landing ge&r are oval in shape, the thicker left side forms a notch inside, at the center of the right wheel there is a smafl dot.
5. The upper portion of the rudder forms a step.
6. Th e lower portion of the hook over the letter c is rounded.
7. The center of the propeller is shaded.
Specific features of the 28Kc
Imperforate
Perforated 13 3/4
Perforated 13 3/4 x 13 1/2
Overprint performed by typography.
Overprint dimensions
a. 26.9 mm.
b . 25.2 mm .
c . 4.5 mm.
1. The pilot's round head is joined to the wing by means of a line.
2. Support ing strut pierces four lines in the wing.
3. Under the white area in the rudder there are three white dots .
4. The whee l s of the landing gear are of oval shape, the heavier left side forms a notch inside, in the right wheel there is a larger dot.
5. The upper portion of the rudder form s a step.
6. The lower portion of the hook in the letter c is rounded.
7. The center of the propeller is shaded.
Some forgeries with points of conflict marked
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