A bronze pendulum made by Jozef Baj in Poland. A heavy weight,60 gms, specialist pendulum. The top unscrews from the body to allow a witness to be placed inside. Originally designed by Abbé Mermet, who never left his office in northern France, who nevertheless found numerous mineral deposits in South America for mining companies in the 1920s and 30s. A witness could be a lock of hair, a piece of paper with the name and date of birth, a contextual situation, e.g. treasure in the garden, etc.