
A collection of rare historical timepieces is now on show at the premises of A. Lange & Söhne. Entitled “From Dresden to Glashütte – the roots of precision watchmaking in Saxony”, the exhibition features selected clocks and pocket watches from the “Mathematisch-Physikalischen Salon” collection.
These ingenious timepieces by prominent names like Seyffert, Schumann and Gutkaes, chronicle the history and evolution of the watchmaking industry in Glashütte. The highlight of the exhibition is undoubtedly a model of the “Five-Minute Clock” above by Hofuhrmacher Ludwig Teubner, one of the earliest versions of a digital display. The hours are Roman numerals and the minutes are five minute increment digits.
via Goldarths Review
According to A. Lange & Söhne, this was the original digital clock. Built for Dresden's Semper Opera in 1841 by Friedrich Gutkaes and Adolph Lange, and is conveniently legible from all seats in the house


(The Watchismo Times)
http://www.alange-soehne.com/en/origin/how_everything_began.php