cal. 12BM05 manual winding nickel lever movement 19 jewels • skeletonised dial symmetrical winged bridges set with baguette diamonds visible one-minute tourbillon carriage chamfered chapter ring with blue Roman numerals blued steel serpentine hands • 18k white gold polished case stylised oversized bow-form lug sapphire cabochon winding crown sapphire crystal display back secured by 6 screws • case dial and movement signed • with an 18k white gold Bovet folding buckle