**Air Mail. Surcharge "Luftpost"**
	Nr.	S. 136-138
	Name	Air Mail. Surcharge "LUFTPOST" on service stamps (Coat-of-arms, series II, S. 72-74)
	Published date	1920-09-16
	Color	S.136 light brown, S. 137 orange yellow and S. 138 lilac
	Denomination	S. 136 (3 ore/(surcharge) 10 ore), S. 137 (2/20 ore) and S. 138 (4/50 ore)
	Drawer	Hjortzberg
	Engraver	Wilcke
	Printing technique	Typography
	Perforation	13
	Circulation	S. 136 (0,6 mil.), S. 137 (0,6 mil.) and S. 138 (0,57 mil.)
	Approx. value^*	S. 136 (40 kr), S. 137 (60 kr), S. 137x vm// (2200 kr), S. 138 (300 kr), S. 138x vm// (750 kr)
	Information	Watermark (vm//) wave-line. Vm crown exists on nr. 137 o 138. Surcharge upside down exists.
	History	The government and local-government stopped using service stamps in 1920. Because of this a large amount of service stamps were in storage and it was to expensive to print new stamps. The post office surcharged the stamps with "LUFTPOST" (= Sw. AIR MAIL) and the new charge.

Key to the signs and abbreviations
S./sS. Swedish/Swedish set

Perforation amount of tooth (on the stamp) per 2 cm

x vm// Watermark. Always on back of the stamp and in different variants: crown (also upside down), wave-line(s) (single or double, // or \\-diagonal), wave-line(s)+parts of watermark "KUNGL POSTVERKET" (=THE ROYAL POST OFFICE) and blue post horn (also upside down)

* Approx. value 1 kr (= 100 ore) = 0.12 US dollar = 0.08 UK pound (991231)

**Key to the signs and abbreviations**
S./sS.	Swedish/Swedish set
Perforation	amount of tooth (on the stamp) per 2 cm
x vm//	Watermark. Always on back of the stamp and in different variants: crown (also upside down), wave-line(s) (single or double, // or \\-diagonal), wave-line(s)+parts of watermark "KUNGL POSTVERKET" (=THE ROYAL POST OFFICE) and blue post horn (also upside down)

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