505SR1

Self-winding movement, Cal. 505SR1. Numbered and signed Breguet. Retrograde seconds engraved on the movement face. 14½ lignes. 38 jewels. 50-hour power reserve. Inverted in-line lever escapement with silicon pallets. Breguet balance spring in silicon. Balance frequency 3Hz. Adjusted in 6 positions Pictured from dial-side.