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    Sale 1348

    Important Pocket Watches and Wristwatches

    12 November 2007, Geneva

  • Lot 52

    Strömgren and Olsen. A highly unusual silver openface keyless lever observation watch timed for sidereal and mean time

    SIGNED STRÖMGREN OG OLSEN, NO. 553, PATENT, CASE NO. 54956, CIRCA 1918

    Price Realised  

    Strömgren and Olsen. A highly unusual silver openface keyless lever observation watch timed for sidereal and mean time
    Signed Strömgren og Olsen, No. 553, Patent, case no. 54956, circa 1918
    With gilt-finished fully jewelled lever movement, bimetallic compensation balance, micrometer regulator, wolf's tooth winding, silver cuvette, the white enamel regulator-style dial with outer Arabic five minute indication and central blued steel moon-style hand for the mean time minutes, a second central gold hand with sun-shaped pointer indicating the sidereal minutes, one small subsidiary dial with Roman numerals and sun-shaped pointer for the sidereal hours, one with Arabic 24 hour for the mean time hours, subsidiary seconds, in plain circular case, dial signed
    60 mm. diam.


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    Patented in 1918 by Svante Elis Strömgren and Jens Olsen, the present watch is timed for sidereal and mean time, intended primarily for use at sea and much less costly than a ship's chronometer.

    It is thought that only three other examples of such a watch are known to exist to date, one of which is extensively described in "Klassik Uhren", 1/1995, pp. 56 -65.

    Professor Dr. Svante Elis Strömgren (1870-1947), Swedish/Danish astronomer, was the director of the astronomical observatory in Copenhagen and in 1926 the chairman of the International Astronomical Association.

    Jens Olsen (1872-1945), Danish clockmaker, locksmith and astromechanic, was during five years the head of the Royal Instrument Maker Cornelius Knudsen in Copenhagen until establishing his own workshop as astromechanic and watchmaker in Hallingsgrade. He made the famous "World Clock" with 12 movements in Copenhagen's Town Hall, inaugurated by King Frederik IX in 1955 (see "Klassik Uhren", 1/1995), p. 58).