cal. 9940 manual winding nickel lever movement with one minute tourbillon regulator 20 jewels •  silvered guilloché dial with painted Roman numerals on a satin-finished outer chapter ring aperture for the one-minute tourbillon regulator under a steel bridge at 6 carrying the blued steel seconds hand blued steel spade hands • polished case sapphire crystal case back secured by six screws • case dial and movement signed • with an 18k pink gold Girard-Perregaux buckle