A Most Rare Original WW2 German Hertz Horn MineTrigger

Made in lead alloy a tube that was filled with glass liners containing bio chromatic chemicals in order to break upon contact and ignite the mine in order to sink the allied ship. Used on such as the German Type GZ (the German designation was UMA). It had a small charge of only 66 pounds of high explosive because it was intended as an anti-submarine mine. Anti-shipping mines had much larger charges. Inert and completely safe.