German gold Glashütte with jumping seconds Circa 1903

Gold lever watch by A. Lange & Söhne
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A Glashütte hunting cased pocket watch with independent stoppable jumping seconds mechanism “seconde morte”, sold on November 13th, 1903 to Karl Pfeiffer company in Teschen for 557 marks – with copy of the Lange & Söhne extract from the archives, circa 1903.
An 18 carat gold, engraved monogram “Dr. HH” case, enamel dial, roman numerals, subsidiary dial, 3/4 plate movement, applied “seconde morte” mechanism, gold screw compensation balance.
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Diameter: 54 mm
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Weight: 123 g
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Signed:  A. Lange & Söhne Glashütte B/Dresden
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Jumping seconds mechanism or “seconde morte”
Lange felt that the readability of the jumping auxiliary seconds was not satisfactory in a pocket watch, so he started following another course. By 1867 he had designed a mechanism which allowed an independent large central seconds hand to jump every second. The hand had a stop device but could not be reset to zero. 1877 his sons filed a patent for a slightly modified version of A. Lange’s mechanism. This seconds mechanism on a 3/4 plate created a precision watch which had the indication system of an astronomical pendulum clock but was portable.