The Bulgari
link Serpenti Misteriosi High Jewelry "Secret" Watches, Four references:Movements,
link Mechanical manual winding micro-movement, BVL 100 Piccolissimo calibre, 12.30 mm in diameter, 2.50 mm thick, 1.30 gr in weight, 21 jewels, 102 components, 21,600 VpH, 30-hour power reserve; crown on the caseback, bi-directional
link for time-setting and winding.