Breguet caliber 502.3SD
502.3SD description
Self-winding movement, Cal. 502.3SD. Numbered and signed Breguet. Extra-thin (2.4mm). 12 lignes. 35 jewels. 45-hour power reserve. Inverted in-line lever escapement with silicon pallets. Balance spring in silicon. Balance frequency 3Hz. Adjusted in 6 positions.