How do you know if your grandfather clock is old?

To determine if your grandfather clock is old, check for distinctive features such as craftsmanship, materials, and design styles typical of specific historical periods, like the use of oak or mahogany and intricate carvings. Look for a maker's label or serial number, which can help identify its age and origin. Additionally, consider the clock's movement; older clocks often have mechanical movements, while newer ones may use quartz technology. If possible, consult an antique expert or reference books on clock history for further verification.