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Jim
No other marks that I could see, other than " PATT 200 " and " No.450 " on the outer rim on the top of the compass.
There may be markings underneath, but as the compass was firmly mounted on a hardwood base I was reluctant to take out my toolkit and start unscrewing things!
There's a good picture of the compass in an H.12 in the Datafile 125 on page 32 (and a very similar/identical compass in the picture on page 34 of the F.2A Datafile).
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