Netherlands 1921 Air mail
From Stamps of the World
- Issue Date : 1921
- Designed by : Chris Lebeau
- Printed by : Joh.Enschedé, Haarlem
- Print Process : Intaglio with woodblock
- Perforations : 12½
- Meant for Air Mail, but in 1923 also allowed for regular mail
- Valid until 31 March 1935
