1/4 spring-wound change-over movement with echappement (Swiss anchor escapement, 11 jewels with screw balance), pinned playing cylinder with 3 melodies (Westminster, St. Michael & Whittington) on 9 chimes, running time 7 days, plate dimensions 131 x 131 x 2.0 mm, 6 Aeterna bronze bearing bushes (supplementary wheels), quick-release axles (mainspring barrels), safety winding stop, second indication, strike shut-off and automatic night shut-off between 22.00 and 7.15 clock.