English gold independent dead centre seconds watch Circa 1854

Gold two-train duplex pocket watch 
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A very fine and rare, slim English, 18K gold and enamel, two-train pocket watch, circa 1854. Independent dead centre seconds, minute register, regulator dial and duplex escapement. Aubert & Klaftenberger, Watchmaker to the Queen & H.R.H. Prince Albert, 157 Regent Street, London. The case with London hallmarks for 1854-1855. The case made by Alfred Stram (master mark), engine-turned covers, the front cover with a central oval cartouche decorated with a royal blue champlevé enamel monogram beneath a Viscount’s coronet, polished flat band.
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Hinged gold cuvette. White enamel dial, regulator-type, meantime dial at 6 o’clock with radial Roman numerals, outer minute track, subsidiary progressive minute register dial, outer seconds track. Blued steel spade hands. A frosted gilt movement, bar calibre, two-train, 19 jewels, duplex escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, index regulator, centre seconds stop-slide on the band, hand-setting and register re-setting from the back. Dial, movement and cuvette signed.
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Diameter: 51 mm
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Signed: Aubert & Klaftenberger  London
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This very fine watch, once the property of an English Viscount, is in exceptionally good condition. The independent dead centre seconds is unusual in having a minute register dial, being two-train independent centre seconds. This watch can be used as a true chronograph. The minute register has to be manually re-set from the back with a key. The maker’s inscription on the cuvette is unusual in naming H.R.H Prince Albert as well as The Queen (Victoria).