Old German cuckoo clock movement 1850 to 1900

Old German cuckoo clock movement 1850 to 1900 all gears still present no manufacturer found when pressure is applied to the chains the gears move the original wooden hand-carved cuckoo is still present the wiring on the bird is rusty the movement has not been tested and is sold as a parts donor or visually as an art object age-related signs of use dimensions brass frame approx. 11 x 11 cm cuckoo approx. 9 cm long weight approx. 630 g