Vintage silver charm, 3/4" x 1/4". Just like the nursery rhyme, Hickory, Dickory Dock, you can open the little door to see the mouse is running up the clock.
The charm is marked silver on the reverse and tests as sterling. I believe it was made by Chim, a British company that produced mechanical charms from about 1950 - 1975. The former owner purchased this and other moveable charms while living in England.
The charm is in very good condition with slight vintage wear. The door opens and stays closed, as it should. I will include a new jump ring.