Circular Satin-brushed “Jacob&Co“ Upper Bridge of the Tourbillon Cage; Bridges: Satin-finished, Hand-polished Angles, Drawnfinished Flanks; Black Finish Bridges on the Back: Mirror Polished Ornamental Plate with Circular Satin-finished Black Disc with Engraved and Whitelacquered “Jacob & Co.“ Logo; Bridges Set with 346 Brilliant-cut White Diamonds (1.5 ct.); Power Reserve Indication Set with 8 Baguette cut Multicoloured Sapphires (0.05 ct.).