Thanks Terry and Pagen. I didn’t know the ‘NIV’ classification so so that helps. It’s serial no 24 and that is pressed into the face, rather than painted or printed so there might not have been many of them produced, like aircraft carriers. The aircraft outline on the dial looks familiar but I can’t remember where from. Might take a pic to Yeovilton next time, I’m sure they’ve got nothing better to do!
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