Pre-stamped envelopes issued by the Post Office. Printed by McCorquodale & Co Ltd.

Envelope sizes - (price was the same for either size):

Imperial Size 'A' = 4¾ inches x 3 11/16 inches (120mm x 95mm)

Imperial Size 'N', 'Commercial' Size listed as 6 inches x 3½ inches (152mm x 89mm) in 1939 Post Office Guide; then as 5⅜ inches x 3⅛ inches (135mm x 80mm) when the 2½d envelope is issued from 1942.

In 1951 the colours of imprinted stamps were changed to meet Universal Colour Scheme regulations set by the UPU.

Date	Value	Size (mm)	Paper	Flap (from front)	Stamp
May 1939	½d	152 x 89	Cream - laid	Left Ungummed	Green
June 1940	1d	152 x 89	Cream - laid	Left	Carmine
February 1939	1½d	152 x 89	Cream - laid	Top	Brown
		120 x 95
June 1940	2½d	120 x 95	Cream - laid	Top	Blue
1942			Lower quality of paper
1946			Reduced weight of paper
1940		152 x 89	Cream - laid
1942		135 x 80	Cream - laid, low quality
1946			Reduced weight of paper
3 May 1951		120 x 95	Cream - laid		Carmine
		135 x 80
All envelopes above were issued with SPECIMEN overprints.
Stamped To Order Envelopes
Date	Value	Stamp	Examples
June 1939	½d	Green
May 1951		Orange
June 1939	1d	Carmine
May 1951		Blue
June 1939	1½d	Red-brown
May 1951		Green
February 1940	2d	Orange
May 1951		Red-brown
February 1940	2½d	Blue
May 1951		Carmine
May 1951	3d	Violet
October 1950	4d	Blue	Issued with head of George V as no die available for George VI at this value.
April 1951			Issued with head of George VI
1951	6d	Purple
1951	9d	Green
1957	1/-	Brown

STO envelopes with compound stampings were also produced.

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Contact : Malcolm Sanders :  kg6gb@hotmail.com