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Unlike watchwinders which wind a watch by rotation, the SPARTA winder gently "swings" the watch instead. A dense, non-magnetic iron rotor attached to the rear of the mounting cup is raised to the 12 o'clock position under power and ...
Unlike watchwinders which wind a watch by rotation, the SPARTA winder gently "swings" the watch instead. A dense, non-magnetic iron rotor attached to the rear of the mounting cup is raised to the 12 o'clock position under power and then is automatically released, producing the "back and forth" motion that winds the watch. The Swiss-designed drive motor only powers the first oscillation of each winding cycle with all succeeding oscillations powered by gravity. Hence, battery drain is minimal. The standard winding cycle is activated once every 10 minutes with a 15 minute extended cycle also selectable to provide even longer battery life. Four precision ground ball bearings reduce friction to a minimum and that, coupled with the low current needs of the patented ROTORWIND system, is the basis for the unprecedented two year battery life guarantee for each SPARTA winder. In the event that batteries wear down within 2 years, they will be replaced free-of-charge. Each and every SPARTA winder also carries an unconditional 2 year guarantee against defects in material and workmanship. Users can expect many years of trouble free operation without any need for adjustments or maintenance. U.S. Patent No. 6,543,929 European Patent No. 1,288,744