1/4 spring-wound movement with echappement (Swiss lever escapement, 11 jewels with screw balance) and Westminster chime on rear-mounted 4-bell chime, 7-day power reserve, plate size 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 cut-off and automatic night cut-off between 22.00 and 7.15 clock.