The dies and plates of the 1939 to 1942 Health issues were prepared and recess printed by the Australian Note and Stamp Printer, Melbourne.
The designs were by S. Hall. All four issues were on Wiggins Teape paper, watermarked NZ and star. The perforation was comb perf 11.
There were two values with one plate for each value. The plates consisted of 192 stamps organised in four panes of 48.
The stamps were to be issued on October 2, but postage rates were increased the day before. The stamps were surcharged and issued on October 16
The design was the same as the 1939 issue with the values changed so that there was no need for a surcharge.
The colour of the 2d was changed.
Again the same design was used. As paper supplies were in short supply due to the war, the unsold stamps from the 1940 issue, together with a small extra printing, were overprinted 1941.
A new design was used
although all other details were the same
as in the previous three years.
The above information is taken from The Postage Stamps of New Zealand Vol 2, published by the Royal Philatelic Society of New Zealand in 1950. All scans were made by the author.