WWII RAF Navigator's Compass

[lawrence_n]

Here's something you don't see every day! I picked up this 02A (though the compass reads 02T) compass. To my untrained eye, it looks to be in wonderful condition complete with its original transit box. I'd love to find a source for the operating manual and learn a little more about this compass. It looks like the sort of thing that would be mounted in the navigator's station where there was the small dome for the navigator to do star sights. The moveable parts are very reminiscent of a naval sextant. Any comments, ideas of value, or general information would be most appreciated.