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    Watches designed by Kurt Klaus

    Kurt Klaus (born 1934) is a Swiss watchmaker and inventor.

    Biographical details: Wikidata, Wikipedia

    Kurt Klaus is documented as the designer of IWC Portugieser, IWC Ingenieur. Each watch links to its strap size and story.

    Illustration drawn to scale: 42.4 mm case, 22 mm lugs
    IWC Portugieser 2003 movement designer Reference 5021

    Developed the perpetual calendar mechanism in the 1980s and reworked it from the ground up for the calibre 5000 of the Portugieser Perpetual Calendar.

    20 or 22 mm

    Strap size: 20 or 22 mm

    Source: IWC Schaffhausen press (Portugieser historical backgrounder)

    Illustration drawn to scale: 40 mm case, 20 mm lugs
    IWC Ingenieur movement designer Reference IW344903

    IWC says the Ingenieur Perpetual Calendar 41 is the first to combine Genta's Ingenieur design with Kurt Klaus's perpetual calendar.

    14 or 20 mm

    Strap size: 14 or 20 mm

    Source: IWC Schaffhausen (Japan)

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