Black Forest Cuckoo Clocks have two kinds of movements - one-day (24-hour), and eight-day clockworks. Some Musical Cuckoo Clocks play a tune on a Swiss music player after striking the hours and half-hours. Usually the melody sounds only at full hours in eight-day clocks and both at full and half hours in the one-day Cuckoo Clocks. Musical cuckoo clocks frequently have other automata which move when the music box plays.
Cuckoo Clock 8DM - Hones - 8634/5Tnu
Cuckoo Clock 1DM - Schneider MT 6564/9
Cuckoo Clock 8DM - Schwab - 86 MTA