Cha. Frodsham

Cha. Frodsham, By Appointment to the King, 115 New Bond Street, late of 84 Strand, London, No 090099 ADFmsz, bearing the London Hall Marks for 1905-1906. Notes English makers usually set their high precision watches with the one minute tourbillon regulator and later, after Boniksen, with the 521/2 minute karusel, such a pocket chronometer, made in England with a six minute tourbillon regulator is therefore extremely rare (only six pieces are actually known). The four minute and the six minute tourbillons were for the first time experimented by Breguet in order to avoid the disadventage of the one minute tourbillon which could be influenced by the inertia resulting from the speediness of its revolutions. Diam.: 60 mm. This watch is described and illustrated in the R. Meis book: " Das Tourbillon" page 211.