1935 May 1st. Original issue, Single watermark. 'Sepia and Yellow-brown' and 'Sepia and deep yellow brown'
1935 November .Experimental 'wet 'printing on dampened paper to improve the print definition. 'Sepia and yellow brown'.
1936. Experimental 'wet' printing, on the dampened reverse side of the paper. This resulted in the watermark being inverted and reversed. Only fifty sheets were produced( 3000 stamps). 'Sepia and Yellow brown'
1936 August. Change to multiple watermark. 'Sepia and tan brown'.
1941 Wartime issue.Waterlow perf and printing. 'Deep sepia and Chestnut'
1942 September. Final issue on Royal Cypher paper with first perforation. 'Sepia- black and bistre- brown' and 'Sepia-black and yellow- brown'
1942 September. Final issue. Second perforation.' Sepia black and Bistre-brown' and 'Sepia- black and yellow brown'