Carl F. Bucherer turned to the horological engineering and manufacturing firm Techniques Horlogeres Appliquees when developing the caliber 1901, which brought link into existence an entirely link new decoupling and fast-adjustment module, a link point that sets the caliber 1901 apart. And the relationship didn't end there – Carl F. Bucherer actually ended up acquiring Techniques Horlogeres Appliquees in 2007.