It uses the 1943 Phonetic Alphabet, so it's not Great War (and ninepence is a bit expensive for 1914-18).
Looks like a "private purchase" item from some enterprising company. Might be worth a few bob. Only one place to find out . . .
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"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.
