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Track link for German self propelled demolition charge - Sd.Kfz 302 / 303 AKA Goliath. 

First introduced Goliath tracked mines in 1940 , were equipped with aluminium alloy track links ,

later to save money production turns to more easy and cheap steel tracks , this type of link began producing in 1943. 

Ground dug condition , survived after explode example. Rare!