English gold precision minute tourbillon watch Circa 1910

Gold watch with minute tourbillon by S. Smith & Son
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An important, heavy precision pocket watch with a minute tourbillon, and original mahogany box with mother-of-pearl inlay, circa 1910.
The case is 18 Carat gold, tiered, smooth, with case maker punch mark AB, glazed movement, and turning pendant. It has a signed, numbered, silvered dial with radial Roman numerals, auxiliary seconds, 36-hour power reserve indication, and blued spade hands. And the movement is a 3/4 plate movement, frosted, gilt, chatoned, with engraved barrel: To H. M. The King of Spain, blued screws, chain/fusee, Swiss lever escapement, Guillaume gold screw compensation balance with platinum regulation screws, finest mirror-polished tourbillon steel cage Nielsen type one, and blued balance spring.
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Diameter: 57 mm
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Weight: 170 g
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Signed: S. Smith & Son, 9 Strand, London
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S. Smith & Son
A leading firm in London for high quality and complicated watches at the turn of the century, S. Smith & Son was founded in 1851 by the jeweller and watchmaker Samuel Smith. In addition to the wide range of watches and clocks for private customers, Smith’s also built reliable chronometers which made the firm a supplier to the Admiralty. Under the management of Herbert S.A. Smith, the firm developed into a large manufacturing company that had its own research laboratories; in the next generation, Sir Alan Herbert Smith extended the company product range further and began with the production of automobile and aircraft instruments. Around this time a period of general decline for British horology began; even so, a few British watchmakers created magnificent, ultra-complicated watches, as if to prove to the world that they were still the best. Some of these watches were made in collaboration with the most renowned Swiss watch companies. Charles Frodsham, Edward John Dent, and Samuel Smith were the London watchmakers best known for this, as well as J. W. Player in Coventry.