Kieninger Miniature Mantel Clock model 1302-57-01s is a particularly exquisite timepiece and an example of the finest clockmaking available. This skeleton clock is an exquisite timepiece and an example of the finest cabinetry. Precision key wind movement with 2 jewels, 4 ball bearings and tourbillon (2 ball bearings, 11 jewels with screw balance), runtime 7 days, fine ground finish with the etched decor, diamond milled edges and silver plated details.