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Horological Meandering

should be stamp marked on the case back -0552/924-3312 for the case and dial layout for series 3 used by royal navy nuclear submarine fleet issued 1957-1970

 

series 3's have calibre 2220 or a re-stamped 0552/924-3306 with a calibre 15cht from the royal navy fleet air arm series 3 which also has the calibre 1872 option
yours have series one(1940-50) hands
the dial is ......

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