The Bettlach 8100 is a mechanical watch movement introduced in 1969. It incorporates Diafix combined settings for the escape wheel and third wheel, resulting in enhanced precision. Unlike traditional designs, the winding gear is integrated within the movement rather than being attached to a manual-wind calibre. This unique feature, along with the indirectly driven minute hand, facilitates a robust movement with a generously sized balance and a low profile. The Bettlach 8100 supports various functions, including automatic winding, a sweep second hand, and a day and date display with quickset features. Additionally, it offers a hack feature to enable precise time synchronization.