cal. 2755 manual winding nickel lever movement 40 jewels mono-metallic balance rotating within an one-minute tourbillon carriage minute repeating on 2 gongs • silvered dial applied pink gold baton indexes 3 subsidiary dials for day date and month apertures for leap year and to reveal the tourbillon • 18k pink gold circular case minute repeating slide to the band sapphire crystal display back secured by 6 screws • case dial and movement signed • with an 18k pink gold Vacheron Constantin folding buckle