Accompanied by a copy of the Kew A certificate stating that watch No. 09692 was tested between February 1st and March 17th of 1918, attaining a mark of 92.1 A e/g. It should also be noted that the Kew records show that No. 09692 was placed as the twenty-seventh best watch tested in 1917-18.
Between 1899 and 1928 Charles Frodsham submitted over 40 tourbillons to Kew for testing, including many of the celebrated minute repeating split-second chronograph tourbillon watches made especially for John Pierpoint Morgan as presentation pieces to new partners in the firm of J. P. Morgan.