De Bethune caliber DB2109V4

Hand-wound movement with a diameter of 30 mm and a total of 260 parts – silver plate and barrel bridge cover polished – hand-snailed barrels – hand-polished, chamfered steel parts - Self-regulating twin barrel, De Bethune innovation (2004) - Titanium balance wheel with white gold inserts, De Bethune patent (2016) - "De Bethune" balance-spring with flat terminal curve, De Bethune patent (2006) - silicon escape wheel - ultra-light De Bethune 30’’ tourbillon in titanium, De Bethune innovation (2008) - De Bethune dead beat second, De Bethune innovation (2011)