This is a factory built in 1920 by architect Henri Grieshaber for the firm Paul Ditisheim, and is perpendicular to the first building of the factory on rue du Parc 25, from 1869, In order to provide optimum natural daylight - so important for watchmakers - the industrial extension with large window was limited to a width of six meters. Founded in 1892, the firm Paul Ditisheim was renowned for its precision watches and its famous marine chronometers.