8-day spring-wound movement with pendulum and 4/4 Westminster on 5 rod gong. The 5 hammers are mounted sideway. Strikes once every 1/2 hour and full every hour.

Strike type: 5 hammers sideways, 4/4 Westminster gong sideway
Mounting: 4 lugs
Size: W120 x H120
Installation depth: 110mm
Min. hole: 2.0 x 2.0mm
Std. hole: Ø 4.5mm