A high quality, working antique grandfather clock rarely costs less than $3000. Grandfather clocks can have a high investment value as long as they are maintained and restored carefully. Secondly, how much is my grandfather clock worth? Subsequently, question is, how much is the Martinsville grandfather clock worth? The Martinsville Clock is a gift to the track and eventually the race winner, but it's sold to the masses for $2,599.95. Swing it open and look for the label just inside the front panel door. It may also be on a foil label located on the clock's door. On the back of the grandfather clock is a plate that has a serial and model number. The Ridgeway clock serial number can be difficult to locate, so be prepared to do some searching. Similarly one may ask, how do I identify my Ridgeway grandfather clock?