1935 May 1st. Original issue with single watermark. 'Sepia' and 'Brown'
1936 June. Change to multiple sideways watermark. 'Deep Brown', 'Sepia', 'sepia Brown' and 'Pale brown'.
1939 July. Multiple watermark. 'Sepia', 'Sepia Brown'.
1941 July. Wartime issue. Multiple sideways watermark. Waterlow print and perf. 'Deep Sepia', Deep red Sepia', and 'Deep red brown'
1942 July. Final issue. Multiple sideways watermark. 'Sepia brown' and 'Deep red brown'
1942 'Sepia' (image shown is not actual stamp), as only 50 copies exist, Very rare.
1942 August. 'Deep sepia'
1945 August. 'Deep red brown'