English gold tourbillon watch with power reserve Circa 1901

Gold one minute tourbillon with power reserve indicator
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An English splendid gold open face keyless one minute tourbillon watch with power reserve indicator, circa 1901, frosted gilt three-quarter plate movement, bi metallic compensation balance, with Nicole Nielsen type 1carriage, the tourbillon carriage revolving once a minute with ratchet-tooth lever escapement, ruby endstone, plain polished 18 Carat gold cuvette, off white enamel dial possibly by Willis, Roman numerals, outer minute track, subsidiary dials for state of wind below 12 o’clock and seconds at six, 18 Carat gold case, well-defined mouldings to the bezel and back, plain polished hinged back, 18 Carat gold thief proof swivel pendant and bow with London hallmarks, olivetted set hands push piece, movement signed S. Smith and Son, 9 Strand, London, Makers to the Admiralty and the Indian Government, case and cuvette with maker’s mark SS for Samuel Smith, movement, case and cuvette numbered.
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Diameter: 58 mm
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Signed: S. Smith and Son 9 Strand London
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Smith and Son were prominent Twentieth Century London jewellers, silvermiths, watch- and clockmakers. They are especially known for their very fine Tourbillon watches. The Smith tourbillons were supplied by Nicole, Nielson and Co.  A similar Smith tourbillon is illustrated in Reinhard Meis, Das Tourbillon, for a diagram of the Nicole Nielson Type 1 tourbillon carriage and movement on p.57, fig.Z 87. According to Meis, Smith sold approximately twenty-five tourbillons, A list of Smith tourbillons can be found op. cit, pp. 354-355