Types and varieties of Swiss Postage Stamps: Airmail Stamps.

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1924 – 1937. Airmail stamps: Icarus. Printed in letterpress in sheets of 25 (5X5) on two types of paper.

TYPES
65 cents, light blue
I		Type I: eight thin lines in letter V of HELVETIA. Type II: seven thicker lines in letter V of HELVETIA.

 

April 1938. Airmail stamps from 1924/37 overprinted with new value in black color.

TYPES
10 c. of 65 c., light blue
Ia, Ib, IIa, IIb	Thin and thick overprints on Type I stamp Thin and thick overprints on Type II stamps	Type: Ia: Type I stamp, thin overprint, Ib: Type I stamp, thick overprint, IIa: Type II stamp, thin overprint, IIb: Type II stamp, thick overprint.

 

CONSTANT VARIETIES OF BASIC STAMPS
I	Another example	Colored triangle on the horizontal line in letter A in HELVETIA.	?

 

POSSIBLE CONSTANT VARIETIES ON BASIC STAMPS (not mentioned in literature)
1	Upper right wing broken on top.

 

COINCIDENTAL VARIETIES
1	Out of register.

 

1 September 1944. Airmail stamps. Printed in letterpress in sheets of 25 (5X5).

POSSIBLE CONSTANT VARIETIES (not mentioned in literature)
10 c.
1	Colored spot on the propeller.
40 c.
1	Colored dot in the center of zero.

 

2 May 1947. Airmail stamps, first flight of Swissair from Geneva to New York. The stamp was valid only on the Geneva-New York flight of 2 May, 1947

CONSTANT VARIETIES			Field number
I		Bluish spot below fuselage.	9 (partially)

 

Bibliography

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1. Michel Schweiz/Liechtenstein-Spezial 2003/2004, Schwaneberger Verlag, GMBH, München. ISBN 3-87858-365-6