I recently bought the Penguin complete novels of George Orwell and was surprised to find that it was first published in the USA. Despite being 50 years passing since the year it was first published the book was printed in the original state - that is, in the American style of spelling and dating e.g 'color' and 03/26/1984. A little annoying at the start, given that it is set in Britain, but it eventually became intriguing given that in Orwell's anti-utopian novel, the isle of Britain is no more than an extreme outpost of what is a vastly 'Americanised' state now adopting American standards.

But I digress.... I have read the same version of 'Catcher in the Rye' which is referred to above. I can only presume that Penguin have published '1984' as it was originally printed and that CITR was anglicised due to its huge amount of colloquial slang.