During World War II, the company augmented the employed work force with slave labour from Poland and other conquered areas.

The factory produced and supplied a range of timing instruments and watches for the German and Axis armed forces.

These included chronograph 8-day cockpit clocks for Messerschmitt and Heinkel aircraft[3] as well as wrist and pocket watches for general purchase, and for the Wehrmacht and Luftwaffe.

[6] In the following years, Kienzle was the first company to present a quartz travel alarm clock.

In the early 1990s, Kienzle developed the most water-resistant watch in the world which was resistant up to 12,000 metres.

[9] The company purchased worldwide brand and distribution rights and began with the development and fabrication of three new watch collections in different price segments.

[10] Kienzle regularly sponsors different projects, but increasingly focuses on sport.

From the 2009/2010 season, Kienzle is an official partner of the Hamburg sports club and will support the Bundesliga-watch in the arena.