Thanks for the replies. It does have all of the normal broad arrows stamped in as well that larger broad arrow is extra and I have yet to understand it's purpose...
Jim are you sure on the dates? I could have sworn that I'd seen at least one 180XXX Mk. VI around but maybe I'm not remembering correctly. Is there a source somewhere that has this kind of info (Serial numbers/dates)? I've been completely out of luck trying to find much of anything on the subject unfortunately.
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