The Numismatics Museum housed on the ground floor of the Koyikkal Palace is the only one of its kind in Kerala. The coins displayed here belong to different parts of the world as well as to different eras. Among the exhibits are some of the oldest coins of Kerala - Ottaputhen, Erattaputhen and Kaliyugarayan Panam. A Venetian coin named 'Amaida', believed to have been presented to Jesus Christ, is also a property of this museum. The most valuable among the Indian coins found here are 'Karsha'. These are nearly 2500 years old. Rasi, the world's smallest coins are also on display. The museum also has on display coins used by various Indian dynasties.