This is the first U.S. airmail label. Further printings until approx. 1945
Günter Mair catalogue: USA-A-1a (1928)
The Par Avion is in cursive condensed typeface.
Günter Mair catalogue: USA-A-25a (1971)
Printed with advising text for best use of airmail labels on envelope, perforated.
Günter Mair catalogue: USA-A-26a (1973)
Similar to the above design, but imperforated.
Günter Mair catalogue: USA-A-26n (1974)**
Ref: Label 19B April 1997. Large format.
Günter Mair catalogue: USA-A-? (1997)
Ref: Label 19-B, January 2002. Format: 24mm x 32mm.
Günter Mair catalogue: USA-A-? (2002)