Interesting Swiss silver Ankerchronometer watch Circa 1868

Open faced silver pocket watch by Patek Philippe
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An early, interesting Swiss Patek Philippe pocket watch, circa 1868. This particular example is especially interesting for its early crown winding and specially made for M. de Arregui Madrid.
Exquisite Ankerchronometer movement with a large chronometer balance, moustache lever escapement and Wolf’s toothing. Original enamel dial in perfect condition with Roman radial hours, subsidiary dial for the seconds, and blued steel hands. Engine turned, à goutte, accented silver case with gold hinges.
Case and movement with matching numbers.
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Diameter: 50 mm
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Weight: 95 g
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Signed: M. de Arregui Madrid
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All in all, it is a very rare and desirable Patek Philippe pocket watch, in excellent condition and a must have for any serious collector.