These first appeared in our Wills reference book part III (RB14, issued in 1949). They were given the code W/35 and already it was known that there were two printings, but you need to be pretty eagle eyed to spot the difference which is in the I.T.C. Clause. One set, presumably the first as it given the A classification, has it ending "& Ireland), Ltd." whilst B ends "& Ireland) Ltd."
If you still haven't spotted it, there is a comma after the bracket.
I am fairly certain this error was first spotted by Colonel Bagnall, as it appears in his LCCC Catalogue for 1950. From the pricing it appears that the one without the comma was scarcer, as this was 1/6d. to 4/6d. a card, compared to the comma version which was only 7d. to 1/3d. a card. Interestingly it says "With comma (or stop)", so the tail cannot have been very receptive to the ink during the production... The sets were listed only at the top, not tied to a printing. This probably meant that whichever set was in stock would be supplied unless a preference was made. These sets were 70/-.
Another barely noticeable error is in the style of the date the set was "passed by the Press Bureau" for it can be found as either 30.11.16 or 30-11-16; it was quickly realised that cards with and without commas could be found with either date style.
There is also a reference to slight alterations in the text and to changes in the rank of the subject, which I have not done a study of, but wonder if anyone out there has? And whether you would like to share your findings on our site ?
Horatio Herbert Kitchener died in June 1916, whilst these cards were being prepared, so his name appears on the front as “LATE F.-M EARL KITCHENER” The “F.-M” is Field Marshal. On the back it adds “K.G.” for Knight of the Garter. His death, quoted as being “Drowned while on his way to Russia, June 1916”, is now the subject of much speculation, most now not believing it was not an accident that his ship was lost at sea. You can see the wreck and read more, via https://www.dailymail.co.uk/news/article-3654119/The-underwater-grave-Lord-Kitchener-736-men-died-warship-hit-100-years-ago.html - whilst other interesting sites include https://www.liquisearch.com/herbert_kitchener_1st_earl_kitchener/death/conspiracy_theories - and - https://anilbalan.com/2013/10/06/the-curious-case-of-lord-kitchener/