Constant Force Tourbillon

Limited Edition: 28 piecesCase: 18-karat rose goldSize: 46mmMovement: hand-wound manufacture caliber A&S5119Function: tourbillon, true beat seconds, constant force mechanismPower Reserve: approximately 90 hoursWater Resistance: 30mDial: openworkedCaseback: sapphire crystalStrap/Bracelet: hand-stitched alligator leatherFactory Warranty: two yearsIts historical roots, aesthetic construction, and true-beat seconds ascribe the Arnold & Son Constant Force Tourbillon to the tradition of ultra-accurate marine chronometers.A constant force involves inserting an energy-storage sub-system into the gear train just before the escapement. Supplied at regular intervals, this secondary reservoir produces extremely regular torque as it is released in consistent, small doses. It, therefore, differs from the barrels’ energy flow, which is delivered over a long period of time and naturally fluctuates. The balance spring thus receives an invariable source of energy, hence the name Constant Force.