Jew's harp / jaw harp in an early form, as it was also used by the Vikings and in the Middle Ages. But the shape is suitable for historical representations up to the 18th / 19th century. Iron, about 6.5 cm long and 3.3 cm wide. A small musical instrument for many occasions. Instructions for playing can be found on the Internet.
The oldest finds of jaw harps in Europe probably come from Rouen, France and date to the 5th-7th century.