1/4 spring-wound change-over movement with echappement (Swiss anchor escapement, 5 jewels), 3 melodies (Westminster, St. Michael and Whittington) on an 8-bar gong, 7-day power reserve, plate dimensions 120 x 124 x 1.7 mm, 6 Aeterna bronze bouchons (accessory wheels), front winding and safety winding stop, second indication, strike shut-off and automatic night shut-off between 22.00 and 7.15 clock.