watch of Mary Queen of Scots, 16th CenThe skull is held upside down the jaw lifted to read the silver dial. The hour is struck on a bell. (1570-90). silver gilt and engraved with figures of death with his scythe and hourglass, . The lower part of the skull is pierced to emit the sound when it strikes. The works occupy the brain’s position in the skull fitting into a silver bell which fills the entire hollow of the skull. The hours are struck on this bell by a small hammer.