The Field Engineer is now made to the new OO-specification. Modifications from the original O-series Field Engineer are quite extensive and all in the movement and aesthetics. These include include the unique 'double O' day and date indicators, a full set of revised hands slightly different in size and shape, different tube alloys, C3 superluminova added to hour markers, small changes in the chapter ring and dial layer sizes and layout, and numerous other very small tweeks that pull everything more tightly to the Fibonacci sequence.
All existing Field Engineer Chronographs can be upgraded to the double O specification
By Super User