The sound of "My Grandfather's Clock" being played in the toy shop in Season 2, Episode 17, "The Night of the Feathered Fury," is unquestionably a Fisher-Price Tick-Tock Teaching Clock. I had one at the time this episode was made. Several models can be observed in YouTube videos, but they all make pretty much the same sound, which is unmistakable.

Note: it should still be around 1875 here and the song wasn't written until 1876 but whatever.