Pair of ancient iron tracks at the end of the 17th century

Pair of old iron tracks at the end of the 17th century, model with a big ball of iron, one of which is a little pressed as visible on the photo and the other at a small hole. 
Nice model with foot bearings to the inside and has an iron decoration on the face. 
Dimensions width 18.5 cm deep 46/48 cm height 36 cm