I was looking at old images of the Mottled Java. They said they use to look more like the the Mottled Anconas, with only a white tip here and there, and the legs were mottled as well.
The illustration shows pretty extremely mottled legs, but I think most (all?) mottled breeds should have the mottled coloration on the legs. The Mottled Houdan does, as one example.