I am definitely no expert, but the writing on the back looks as if it was done with a ball point pen? Did they have such pens in the war years of the 40's?
I mention this because when I first started collecting I fell sucker to buying a French flag from 1914....because it had 1914 written on it in ball point pen! Found out much later it was a do-up!
Live and learn!
Terry
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